Thursday

July 31, 2014

July 31, 2014

Number of results: 56,099

**Physics - Electricity**

Three resistors (15, 20, 25 ohms in this order) are connected to a 13-V battery . The internal resistance of the battery is negligible. What is the voltage difference across the 20-Ω resistance?
*April 4, 2013 by Amy*

**Electricity and Electronics**

A circuit contains twodevices that are connected in parallel. If the resistance of one of these devices is 12 ohms and the resistance of the other devices is 4 ohms, the total resistance of the two devices is? 1/R = 1/R1 + 1/R2 You have R1 and R2. Solve for R. It will be less ...
*June 15, 2006 by jackie*

**electricity**

the magnitude of the voltage induced in a conductor moving through a stationary magnetic field depends on the ------- and the------- of the conductor. A)lenght, speed. B)distance, circumference. C)resistance, current. D)color, capacitance. length and speed...you are cutting ...
*August 23, 2005 by angela*

**Electricity**

Just a quick one: Is current (I) directly proportional to resistance (R) in a piece of resistance wire? Would the current - resistance graph be a straight line or a curve? Help greatly appreciated. It would not be a straight line. For a fixed applied voltage V, current is I = ...
*February 25, 2007 by John*

**math**

In a normal month you use 1200 kWh of electricity. Your electricity provider has decided to increase the rate it charges for electricity by $0.05 per kWh. If you continue to use electricity at the same rate, how much more will it cost for one year? explain plz!!!
*October 29, 2013 by anonymous0.1*

**Physics/electricity**

Eighteen-gauge wire has a diameter of 1.024 mm. Calculate the resistance of 19 m of 18 gauge lead wire at 20°C.
*October 6, 2013 by Joe*

**electricity**

measure resistance with a multimeter in a circuit is the power going to be off or on i think ON
*January 19, 2012 by LISA*

**Physics**

Two resistors connected in series have an equivalent resistance of 783.4 Ω. When they are connected in parallel, their equivalent resistance is 171.3 Ω. Find the resistance of each resistor. 1) small resistance (ohm) 2) large resistance (0hm)
*September 8, 2013 by gita*

**Physics**

Hi. This question is from my own point of view based on electricity. Is it possible in theory to have electricity passed through wireless rather than using wires????
*June 17, 2013 by anonymous*

**physics**

explain the close relationship between magnetism and electricity? and How can electricity produce magnetism, and magnetism produce electricity.
*July 3, 2009 by Leslie*

**physics**

Your electricity usage for a one month period is 500 kilowatt-hours. Assuming one month is equal to 30 days and that the electricity usage is uniform across the whole month, what would be the velocity of a 1 kg mass if it was given the kinetic energy equivalent to one day's ...
*November 3, 2011 by pakilina*

**physics - electricity **

Does the size of a 1,5V cell(battery) affect the internal resistance of a circuit containing: 3 different size batteries,multimeter,connecting wire,a light bulb resistor.How do i set up this experiment.I'm really lost, please help. Thank you in advance
*May 23, 2010 by Luke*

**Physics - Electricity**

Can you please check my answers. 1) What carries energy through wire? electrons 2) What happens to some of the energy when it moves through the wire? becomes lost due to the movement of energy requiring some kinetic energy 3) If a resistance is large, why does the wire heat up...
*November 24, 2007 by xX_Supaman_Xx*

**PHysics**

describe briefly how a generator works. Well, I'm in the electricity unit of my course, so would this mean I have to describe how electricity's generated?
*December 28, 2008 by Jane*

**Physics resistance question**

A piece of copper wire of resistance R is cut into 10 equal lengths. These parts are connected in parallel. How does the joint resistance of the parallel combination compare with the original resistance of the single wire?
*February 21, 2012 by Anonymous*

**physics**

Two resistors connected in series have an equivalent resistance of 783.4 Ω. When they are connected in parallel, their equivalent resistance is 171.3 Ω. Find the resistance of each resistor. Ω (small resistance) Ω (large resistance
*September 6, 2013 by priya*

**physics**

Can water,air and earth conduct electricity? If yes, then explain how they conduct electricity.
*February 3, 2012 by mikylexes*

**Engineering Science (Physics)**

A platinum coil has a resistance of 3.146(ohms) at 40'C and 3.767(ohms) at 100'C. Find the resistance and the temperature coefficient of resistance at 0'C. Thanks in anticipation
*March 14, 2012 by Xyler*

**physics**

Three resistors are connected to a 20 V battery as shown. The internal resistance of the battery is negligible. (a) What is the current through the 15 resistance? (b)What is the voltage difference across the 20 resistance?
*December 1, 2012 by luz*

**physics**

A certain copper wire has a resistance of 12.0 \Omega.At what point along its length must the wire be cut so that the resistance of one piece is 5.0 times the resistance of the other?
*September 23, 2010 by rabiya*

**essay: inventions**

I have to write an essay for my english class. The "subject" is inventions. I came up with the phone, the car, electricity, and peanut butter. Peanut butter was more of a joke. I think that I should do electricity. If I did electricity, I could put different things that we ...
*January 22, 2012 by 12-year-old-poet*

**Ohm's LAW ELECTricity shop**

what is the resistance if a circuit with 120v and 5A its 24 how do i make a diagram of a circuit based on the info above
*November 8, 2011 by Adam*

**Physics**

Three resistors having the same resistance value are wired in parallel. How does the equivalent resistance compare to the resistance value of a single resistor? The equivalent resistance is thrice the value of a single resistor. The equivalent resistance is the same as the ...
*October 22, 2012 by BoBo*

**statistics**

The quarterly seasonal indexes for a firm’s electricity consumption are 115, 92, 81, and 112 for quarters I-IV. It has been forecast that electricity consumption will be 850,000 kilowatt-hours during 2008. Forecast electricity consumption for each quarter of 2008
*August 16, 2009 by Yadira M*

**Electricity and Electronics**

if the resistance of an circuit is 12 ohms and the voltage in the circuit is 60 V, the current flowing through the circuit is? Are you talking d.c.? E = IR, solve for I and I = E/R E = 60 V R = 12 ohoms
*June 15, 2006 by jackie*

**chemistry**

22. Choose the best description for a solid held together by London forces. A. This substance melts at -30 °C to give a liquid that does not conduct electricity. B. This substance melts at 650 °C and both the solid and liquid phases conduct electricity. C. This substance melts...
*February 13, 2011 by Kathy R*

**physics**

A silver wire has resistance of 2.1ohms at 27.8 degree celsius and resistance of 2.8ohms at 98 degree celsius. Determine the temperature coefficient of resistance of silver wire and its resistance at zero deg.
*March 16, 2010 by Edwin*

**Physics**

Assuming 100% of your energy can be converted to electrical power, and electricity costs $0.10 for 1 kilowatt-hour, how high should you climb to make one penny's worth of electricity? Show all work & units. I have 288.8 watts, and that's as far as I have been able to reach.
*October 5, 2010 by Amber*

**math**

Consumers pay for electricity by the kilowatt-hour (the amount of electricity used by a 1,000-watt appliance in one hour). If electricity costs 10cents per kilowatt-hour, what is the cost of running a 100-watt lamp for 1. 1 hour? 2. 24 hours? 3. 1 year?
*December 7, 2010 by Mike*

**physics **

What is the resistance of the coil A at 600 kelvin if its resistance at 300 kelvin is 50 ohms? (Assume the temperature coefficient of resistance of the coil is .007/ degrees C)
*May 29, 2011 by ashley --- HELP PLEASEE!!!*

**Science**

Why do we have an electricity crisis? What will happen if we don't save electricity?
*April 15, 2009 by Rochelle*

**Science**

I need help with static electricity and generating current electricity.
*November 13, 2012 by Aamira*

**chemistry**

Suppose a fuel-cell generator was used to produce electricity for a house. If each H2 molecule produces 2e- , how many kilograms of hydrogen would be required to generate the electricity needed for a typical house? Assume the home uses about 850 kWh of electricity per month, ...
*July 11, 2010 by seth*

**chem**

Suppose a hydrogen-oxygen fuel-cell generator was used to produce electricity for a house. Use the balanced redox reactions and the standard cell potential to predict the volume of hydrogen gas (at STP) required each month to generate the electricity needed for a typical house...
*August 9, 2010 by Anonymous*

**Chemistry**

Suppose a fuel-cell generator was used to produce electricity for a house. If each H2 molecule produces 2e- how many kilograms of hydrogen would be required to generate the electricity needed for a typical house? Assume the home uses about 850 kWh of electricity per month, ...
*April 13, 2012 by Anonymous*

**Physics**

The nominal resistance R of the resistor used in this experiment was printed on the resistor by the manufacturer. According to the manufacturer, the actual resistance of the resistor should not differ from its nominal value by more than 1%. Does your most accurate measured ...
*February 23, 2010 by Joseph*

**physics: Electricity/Resistance**

If I have a 9V circuit, with: 2 resistors in parallel; followed by: 2 single resistors in series; and I calculate the effective R of the parallel pair (using 1/R=1/R1+1/R2); can i then add this value to the series resistors to get a total for the circuit? As in: (1/R=1/R1+1/R2...
*February 16, 2009 by charlie*

**Chemistry**

Suppose a fuel-cell generator was used to produce electricity for a house. If each H2 molecule produces 2e-, how many kilograms of hydrogen would be required to generate the electricity needed for a typical house? Assume the home uses about 850 kWh of electricity per month, ...
*July 30, 2011 by norma*

**Physics**

Please check my answers: The voltage across a 10-ohm resistor carrying 3 amps must be? I got 30 volts-v=?, I=3 amps, R= 16 ohm. v= 30 amps * 10 ohm=30 volts A 4-ohm resistor is connected in parallel with a 6 ohm resistor. What is the total resistance of this pair of resistors...
*October 24, 2007 by Shay*

**Physics**

In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 8A (amperes), the resistance is 15 ohms. What is the current when the resistance is 4 ohms?
*February 9, 2011 by Rachal*

**Physics Electricity and magnetism**

A current with sinusoidal time-dependence, whose peak value is 3.55 A and frequency is 463 cycles per second, passes through a long straight wire. A rectangular 72.2 cm × 32.5 cm loop of copper wire is located 80.2 cm from the wire and is coplanar with it. Calculate the ...
*April 28, 2013 by JD*

**Math**

The total resistance of two circuits in parallel is 15 ohms and one circuit has five times the resistance of the other, find the resistance of each circuit. Use 1/R=1/R1+1/R2. R1 and R2 are two individual resistances. a)Find the smaller resistance b)Find the larger resistance
*March 12, 2013 by Megan*

**Chemistry **

Suppose a hydrogen-oxygen fuel-cell generator was used to produce electricity for a house. Use the balanced redox reactions and the standard cell potential to predict the volume of hydrogen gas (at STP) required each month to generate the electricity needed for a typical house...
*April 13, 2010 by Katelynn*

**physics**

Two resistors connected in series have an equivalent resistance of 790.6 . When they are connected in parallel, their equivalent resistance is 170.2 . Find the resistance of each resistor. (small value) (large value)
*February 20, 2012 by Anonymous*

**Physics**

If the resistance of each of the light bulbs is 6.0 ohms, what resistance does the battery see?
*November 8, 2011 by Elisabeth*

**Physics**

What is the diameter of a 1.00 meter length of tungsten wire whose resistance is 0.32 ohm (electrical resistance)?
*February 8, 2008 by Jenny*

**Physics**

what current will flow through a resistance of 11 ohms when the emf impressed acrosss the resistance is 2.8 volts?
*May 17, 2011 by Nilan*

**physics**

if a wire of length 12cm it stress up to 25m what will be the final resistance .it initial resistance is 16ohm?
*September 13, 2012 by sid*

**Physics**

What resistance must be placed in parallel with a 152 resistor to make the equivalent resistance 111 ? Please help!!!!!
*September 7, 2007 by Jim*

**physics**

if three resistances in parallel circuit are all equal, the total resistance is ___ the resistance of any on branch.
*May 18, 2011 by Sushmitha*

**physics**

if three resistances in parallel circuit are all equal, the total resistance is ___ the resistance of any on branch.
*May 18, 2011 by Sushmitha*

**Electricity**

RCL Circuits electricity!? A 50V, 50Hz supply is connected to a series circuit consisting of a resistance, a 20mH inductor and a capacitor. a) Find the value of the capacitance and the power dissipated in the circuit when: (i) The current has a magnitude of 25A and leads the ...
*January 21, 2010 by Claire*

**PreCalc**

The total electrical resistance R of two resistors connected in parallel with resistances R1 and R2 is given by 1/R=1/R1+1/R2. One resistor has a resistance of 2.3 ohms. Let x be the resistance of the second resistor. Express the total resistance R as a function of x. How do I...
*December 1, 2010 by Linda*

**physics**

A resistor of resistance R is connected to a power supply of constant EMF E=12 V and internal resistance r=3 Ω . The energy dissipated in the resistor R is used to heat water. What resistance R in Ohms gives the maximum power dissipated in the resistor?
*May 13, 2013 by intermediate player PLEASE HELP*

**physics-series and parellel circuits**

I'll try to explain the schmatic drawing... a 120V battery, total of 12A, leads into a 8ohm resistor (R1), then breaks off into two parallel lines, R2 and R3. the resistance is unknown in R2, and in R3 the resistance is 3 ohms. I need to find the Amperage in R1,R2 and R3 as ...
*May 20, 2012 by Dav e*

**physics**

A student conducted an experiment to determine the resistance of a lightbulb. while performing the experiment the student noticed that the lightbulb began to glow and became brighter as she increased the voltage. of the factors affecting resistance, which factor caused the ...
*May 20, 2007 by koeit*

**physics Important please**

A metal wire has a resistance of 8.00Ω at a temperature of 20C. If the same wire has a resistance of 8.40Ω at 70C, what is the resistance of this wire in ohms when its temperature is −10C?
*November 12, 2013 by manu*

**Science**

Solid table salt does not conduct electricity. How does dissolving salt in water allow electricity to flow?
*December 1, 2009 by Easton*

**Physics**

your friend says that the equivalent (combined) resistance of resistors connected in series is always more than the resistance of the largest resistor. Dou you agree?
*April 11, 2010 by Don*

**science**

Why are plasmas able to conduct electricity? Plasmas are electricity: all ions, free to move.
*January 23, 2007 by Ryan*

**Science 2 questions**

how and where is electricity generated in British Columbia, Canada? describe how most of the electricity is generated in England or another country. But it must be different than what occurs in B.C. Please help, thanks:)
*April 9, 2013 by Olly*

**physics**

Touch a 5000-V charged balloon and you're not harmed because, although the energy/charge ratio is high, there is ____________________. A) very little conduction of electricity.B) very little energy on the balloon.C) no way this large amount of energy can transfer under normal ...
*April 10, 2012 by Kristie*

**Physics**

I need help. Resistor 1: Watts=? Current=? Resistance=520 Volts=? Resistor 2: Watts=? Current=? Resistance=? Volts=57.5 Resistor 3: Watts=? Current=? Resistance=1200 Volts=? Total: Watts=? Current=? Resistance=? Volts=280 Find Resistor 2's resistance. Please help and Thank you
*September 21, 2013 by Anonymous*

**physics**

When 3 resistors of 1 ohm resistance each are connected in series to a 12 volt power supply, the total resistance of the circuit is _______ ohms. I really appreciate any help with this stuff - it's difficult for me! Thanks
*July 20, 2008 by Claire*

**Physics**

Four resistors each of resistance 4 Ù are connected to form a square loop. What is the equivalent resistance between two points on its diagonal AC or BD? A-------------D | | B-------------C That's what it looks like on my homework. Thank you in advance
*January 24, 2013 by Physics fail*

**physics**

Consider a five-pointed star made of resistors as shown below. Each resistor has resistance R=6 Ω. Find the equivalent resistance in Ohms between the points A and B.
*April 27, 2013 by ayan*

**physics**

Consider a five-pointed star made of resistors as shown below. Each resistor has resistance R=6 Ω. Find the equivalent resistance in Ohms between the points A and B.
*April 27, 2013 by ayan*

**Physics**

The battery in the circuit diagram has an EMF of 12V and an unknown internal resistance r. Voltmeter V1 is connected across the battery and voltmeter V2 is connected across the switch S. The resistance of the connecting wires and the ammeter is negligible. calculate the total ...
*October 11, 2010 by Jennifer*

**Physics**

The battery in the circuit diagram has an EMF of 12V and an unknown internal resistance r. Voltmeter V1 is connected across the battery and voltmeter V2 is connected across the switch S. The resistance of the connecting wires and the ammeter is negligible. calculate the total ...
*October 11, 2010 by Jacqui*

**Physics!! Help!!!!!**

A wire of length L and cross-sectional area A has resistance R. What will be the resistance R_stretched of the wire if it is stretched to twice its original length? Assume that the density and resistivity of the material do not change when the wire is stretched. Express your ...
*February 15, 2012 by Melissa*

**physics**

(a) What is the hot resistance of a 24 W light bulb that runs on 120 V AC? (b) If the bulb's operating temperature is 2700°C, what is its resistance at 2570°C?
*September 15, 2013 by Justin*

**physics**

(a) What is the hot resistance of a 24 W light bulb that runs on 120 V AC? (b) If the bulb's operating temperature is 2700°C, what is its resistance at 2570°C?
*September 15, 2013 by Justin*

**Physics**

Please help!!!!! What resistance must be placed in parallel with a 152 ohm resistor to make the equivalent resistance 111 ohm?
*September 10, 2007 by Jim*

**Physics **PLEASE HELP****

During a short circuit, why does the voltage go down? I know that the resistance is almost zero...but what's the relation between resistance and voltage?
*May 22, 2008 by David*

**physics**

If three identical resistors are connected in series to a battery, the resistance of the combination will be ___ times the resistance of any one of the resistors.
*May 18, 2011 by Nabil*

**physics**

an infinite ladder network of resistance is constructed with 1 ohm and 2 ohm resistances .calculate equivalent resistance between points a and b
*February 26, 2013 by maneet*

**physics**

the resistance of copper wire of length 1m is 0.1 ohm the diameter of the wire is 0.045cm find its specific resistance
*March 5, 2013 by amit kumar*

**physics**

two copper wires A and B are of the same length. If the diameter of A is 3 mm and its resistance is 3 ohms, what is the diameter of B if its resistance is 0.08 ohm ?
*May 19, 2014 by yhojsgarcia*

**Physics**

In the drawing below, R1 has a resistance of 6.2 Ù and R2 has a resistance of 2.6-Ù. Determine the current (magnitude and direction) in the 6.2 and 2.6-Ù resistors in the drawing.
*February 24, 2013 by Don*

**Physics**

In a hydroelectric dam, water falls 26.0 m and then spins a turbine to generate electricity. What is ∆U of 1.0 kg of water? Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must pass through the...
*November 30, 2009 by Zach*

**Physics**

Two resistors of equal resistance are connected in series with each other and are connected to a battery that produces a potential difference of 8 V. If the current is 0.2 A what is the value of each resistance?
*November 29, 2012 by Stan*

**Physics**

Two resistors of equal resistance are connected in series with each other and are connected to a battery that produces a potential difference of 8 V. If the current is 0.2 A what is the value of each resistance?
*December 2, 2012 by Shane*

**Physics**

Two resistors of equal resistance are connected in series with each other and are connected to a battery that produces a potential difference of 8 V. If the current is 0.2 A what is the value of each resistance?
*December 2, 2012 by Sarah*

**physics**

a wire of resistance 5omega is bent in the form of a closed circle . what is the effective resistance between the two points at ends of any diameter of the circle?
*June 9, 2014 by jatin*

**Physics -Electricity**

Several appliances are supplied with a potential difference of 314 V and are operated continuously for a 24 h period. How much energy is used if the appliance is a 30.0 W stereo? Answer in units of J How much of energy is used if the appliance is an electric oven that draws 70...
*February 6, 2012 by Anonymous*

**physics**

What is the resistance of 6.2mi of copper wire with a diameter of 0.57mm ? The answer is suppose to be in Kohm for the resistance i got 656.9 ohm but dont know how to convert it in to kohm
*January 27, 2011 by Cassie*

**Physics**

A wire 3.00 m long and .450 mm2 in cross-sectional area has a resistance of 41.0Ω at 20 degrees C. If its resistance increases to 41.4Ω at 29.0 C, what is the temperature coefficient of resistivity?
*February 7, 2011 by Aryan*

**Physics**

A wire 3.00 m long and .450 mm2 in cross-sectional area has a resistance of 41.0Ω at 20 degrees C. If its resistance increases to 41.4Ω at 29.0 C, what is the temperature coefficient of resistivity?
*February 7, 2011 by June*

**physics**

A wire of uniform thickness with a resistance of 27 ohm is cut into three equal pieces and are joint in parallel.find the resistance of the parallel combination.
*May 1, 2014 by archit*

**Pre-Calc**

Hello, I am not sure how to go about solving this equation: The total electrical resistance R of two resistors connected in parallel with resistances R1 and R2 is given by 1/R=1/R1+1/R2. One resistor has a resistance of 2.3 ohms. Let x be the resistance of the second resistor...
*December 6, 2009 by Jon*

**physics**

A resistor is to have a constant resistance of 30(ohm), independent of temperature. For this, an aluminum resistor with resistance R1 at 0(Celsius) is used in series with a carbon resistor with resistance R2 at 0(Celsius). Evaluate R1 and R2, given that a1=3.9 x 10^-3 degree ...
*February 6, 2011 by carlo*

**physics**

The ammeter your physics instructor uses for in class demonstrations has a resistance R(g)= 60 ohms and requires a current of 1.0 mA for a full scale deflection. The same ammeter can be used to measure currents of much greater values by wiring a shunt resistor of relatively ...
*November 23, 2011 by Jp*

**Science**

There are two light bulbs in a circuit, wired in parallel. A third light bulb is added again in parallel. What is the effect on total resistance of adding this third bulb? I BELIEVE THE ANSWER IS C.... a. Total resistance increases by one third. b. total resistance triples c. ...
*February 28, 2009 by Jenny*

**Science**

When people want to use water to create electricity they generally build a dam to hold the water back, creating a large lake behind the dam. Why is it necessary to hold the water back with a dam in order to produce electricity? A)It increases the amount of water available. B)...
*April 4, 2012 by Mia pleaseee helppp*

**College Physics**

On average, an electric water heater operates for 3.4h each day. If the cost of electricity is $0.3 kWh, what is the cost of operating the heater during a 30-day month? The power of a typical electric water heater is 4500 W. Cost= Dollars What is the resistance of a typical ...
*February 6, 2010 by Lanise*

**Physics**

A 75.0-kg cross-country skier is climbing a 3.0o slope at a constant speed of 2.00 m/s and encounters air resistance of 25.0 N. Find his power output for work done against the gravitational force and air resistance. (b) What average force does he exert backward on the snow to ...
*June 10, 2014 by Anonymous*

**Physics**

A 75.0-kg cross-country skier is climbing a 3.0o slope at a constant speed of 2.00 m/s and encounters air resistance of 25.0 N. Find his power output for work done against the gravitational force and air resistance. (b) What average force does he exert backward on the snow to ...
*June 10, 2014 by Anonymous*

**physics**

(a) What is the resistance of a 120 , a 2.50 k, and a 4.00 k resistor connected in series? (b) What is the resistance if they are connected in parallel?
*February 24, 2013 by taryn*

**Physics**

Please give me numerically answer of tata mcgrawhill book class 10 of physics electricity total unsolved
*August 4, 2011 by Abhishek kumar sahi*

**Science**

List ways simple plants affect your life each day. (HINT: Where do electricity and heat for homes come from?) food, heat and electricity(from fossils and coal and oil), cars (gasoline from oil), etc.
*February 7, 2007 by Jessica*

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