# physics: Electricity/Resistance

74,005 results

### 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?

### Physics

A storage battery has an emf of 6.3 volts and an internal resistance of 0.01 ohm. it is to be charged for 120 amperes.hours from a 30 volt emf source having a resistance of 0.08 ohm at the rate of 20 amperes. a. compute for the resistance needed b. what is the cost of ...

### Science

Our electricity bills consist of many different forms of energy use. In order to be able to make estimates on how much different appliances use electricity and how much savings could be done by investing less electricity consuming ones, you need to have understanding on ...

### 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 ...

### electricity

What resistance must be connected in parallel to 60 ohms to reduce the combined resistance to 15 ohms?

### 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 ...

### 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 = ...

### physics

if a electricity genreter move with the speed of 60km/h how much electricity they generate in 1 minute in volt

### 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!!!

### 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.

### 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????

### physics

explain the close relationship between magnetism and electricity? and How can electricity produce magnetism, and magnetism produce electricity.

### electricity

measure resistance with a multimeter in a circuit is the power going to be off or on i think ON

### Physics (Electricity)

A meter has a resistance of 75 ohms and gives full-scale deflection when it passes a current of 1.0 mA. How would you adapt the meter to read a) Currents up to 1A b) voltages up to: 5V c) Voltages up to: 100V

### 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)

### PHYSICS(MCAT)

an area several km from an electricity generating station requires 120kw power on average the total resistance is line is 0.4 ohm calculate power loss if the transmission is made ata low voltage 240V

### science

Which of the following statement best describes the two different types of electrical energy involved in the situation above? 1.Both the lightning and the electricity used to light the floor lamp are forms of static electricity. 2. Both the lightning and the electricity used ...

### 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 ...

### 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

### 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...

### 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?

### Electricity and Electronics

A complete circuit contains two parallel-connected devices and a generator for providing the electromotive force. The resistance of the first device is 12 ohms, the resistance of the second device is 4 ohms, and the voltage developed by the generator is 40 V. What is the ...

### 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?

### 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

### physics

Can water,air and earth conduct electricity? If yes, then explain how they conduct electricity.

### physics

Temperatures are often measured with electrical resistance thermometers. Suppose that the resistance of such a resistance thermometer is 177Ω when its temperature is 28.7 °C. The wire is then immersed in a liquid, and the resistance drops to 116Ω. The temperature ...

### physics

a family goes on vacation for a week and leaves on a fan that consumes electricity at the rate of 200 watts. If the electricity is $0.14/kWh, how much does it cost to run the fan during this time?

### physics

a cell of emf 10v and internal resistance 2ohms is connected in series with an ammeter resistance 0.5ohms and a load of resistance 7ohms. Calculate (A) the potential difference across its terminal (B)the voltage drop

### 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?

### 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

### 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?

### 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 ...

### 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?

### physics

a wire of lengh 2meter has a resistance of 4 ohms,obrain the resistance if specific resistance is doubled,diameter is doubled and the length is made three times of the first.

### 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

### AP Physics

An electric furnace runs nine hours a day to heat a house in January (31 days). The heating element has a resistance of 10.6 ohms and is hooked up to a 240 Volt potential. What does it cost to run the furnace in the month of January if the cost of electricity is $0.15 per KW*...

### Physics

How can you explain work, in regards to electricity? I understand it as the product of energy used, usually displacement. I cant understand or explain it as far as electricity is concerned. I'm not sure if I understand it at all.

### 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 ...

### Physics

A 50 ohm resistor consists of a copper portion joined to carbon portion, the resistance of the resistor being the sum of the resistance for 2 portions. Find the resistance of the copper portion of the resistor so that the combined resistance will be constant at all temperature.

### 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

### 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 ...

### 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

### 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.

### 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.

### 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?

### physics

a wire of lengh 2meter has a resistance of 4 ohms,obtain the resistance if specific resistance is doubled,diameter is doubled,and the lengh is made three times of the first.plsss help me!

### physics

1) a wire of length 1m has a resistance of 2 ohm.obtain the resistance if specific resistance is double,diameter is double and the length is made three times of the first.

### Science

Why do we have an electricity crisis? What will happen if we don't save electricity?

### Science

I need help with static electricity and generating current electricity.

### 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)

### Algebra 1- Please help whenever you get the chance

The monthly cost of electricity in Smithville is determined by the function C(e) = $0.16e + $24.54, where e is the amount of electricity used in kilowatt-hours (kWh) and C(e) is the total cost. If the Fox family used 872 kWh of electricity last month, how much was their bill? ...

### Physics

A car drives at 15 m/s and has an air resistance force of 277 N. What is the air resistance force at 30 m/s? A truck drives at 9.7 m/s and has an air resistance force of 380 N. What is the air resistance force at 32 m/s? A 85.0 kg skydiver is falling at a constant speed of 32....

### electricity

A series RL circuit contains two resistors.The resistors are 60ohm and 30ohm.when calculating the circuit values, what is the total resistance?

### 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, ...

### 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...

### 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, ...

### 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 ...

### 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...

### 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...

### 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, ...

### Science: Physics

An electric heater of power 2500 W is connected to a voltage of 230 V. i) Calculate the electric current going through the heater. ii) What is the resistance of the heater? iii) How much energy does it consume in a year, if it is switched on 15 min every day. iv) How much it ...

### 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 ...

### 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?

### 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

### 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...

### Physics

If the resistance of each of the light bulbs is 6.0 ohms, what resistance does the battery see?

### 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)

### Physics

What is the diameter of a 1.00 meter length of tungsten wire whose resistance is 0.32 ohm (electrical resistance)?

### Physics

what current will flow through a resistance of 11 ohms when the emf impressed acrosss the resistance is 2.8 volts?

### physics

if a wire of length 12cm it stress up to 25m what will be the final resistance .it initial resistance is 16ohm?

### physics

Find the potention difference across a resistance whose effective resistance is 10R and its current is 2A

### Physics

What resistance must be placed in parallel with a 152 resistor to make the equivalent resistance 111 ? Please help!!!!!

### physics

if three resistances in parallel circuit are all equal, the total resistance is ___ the resistance of any on branch.

### physics

if three resistances in parallel circuit are all equal, the total resistance is ___ the resistance of any on branch.

### 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 ...

### Physics

Which of the following statements about Ohm’s Law is true? A. Keeping the same voltage and decreasing resistance decreases the current. B. To increase the current, decrease the resistance. C. Ohm’s law relates power, current and resistance. D. Increasing the voltage ...

### 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?

### 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 ...

### 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...

### 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 ...

### physics

A galvanometer of resistance 50 ohm which gives a full deflection for 1mA is to be adapted to measure currents up to 5A. Calculate the resistance of the resistor required

### 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?

### Science

Solid table salt does not conduct electricity. How does dissolving salt in water allow electricity to flow?

### Physics Resistance

A piece of wire of resistance, R and uniform cross sectional area, A is cut into four equal parts and bundled together to form a thicker wire. The resistance of the bundled wire is: A 16R B 1/4R C 4R D 1/16R It's either 16 or 1/16 im not sureee. So I need help for the working ...

### Chemistry

A household receives a $155 electricity bill. The cost of electricity is $0.129/kWh.How much energy, in joules, did the household use?

### 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?

### science

Why are plasmas able to conduct electricity? Plasmas are electricity: all ions, free to move.

### science

A certain quantity of electricity deposits 0.54grams of silver nitrate solution. What volume of H2 will be liberated by the same quantity of electricity at 27 ° C and 750 mm of Hg pressure

### 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:)

### 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 ...

### 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

### physics

Two 1.30-V batteries-with their positive terminals in the same direction-are inserted in series into the barrel of a flashlight. One battery has an internal resistance of 0.182Ω, the other an internal resistance of 0.139Ω. When the switch is closed, a current of ...

### 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

### 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

### 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.

### 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.

### physics

Agalvanometer of resistance 25 ohmes shows full scale deflection for current of 10mA, to convert it into 100 V range voltmeter , the required series resistance is

### Physics

A 12-V automobile storage battery has an internal resistance of 0.004 ohms. A) Find the current and power dissipation when the terminals are connected by a conductor of negligible Resistance B) The battery delivers 80A to the starter motor. What resistance would draw the same ...

### math

The daily electricity bill of a car manufacturing company can be modeled by the function C(x) = 800 – 10x + 0.25x^2, where C is the daily electricity bill, and x is the number of cars made each day. How many cars should the company make to pay the lowest amount for ...