# Physics (URGENT)

Three wire-wound resistors have the following values: 30 ohms, 80 ohms, and 100 ohms. Each resistor has a voltage rating of 100V. If these three resistors are connected in series, can they be connected to a 240V circuit without damage to the resistors? Explain your answer.

1. 👍 1
2. 👎 0
3. 👁 1,278
1. total R = 210 ohms, so current is 240/210 = 8/7 amps

E=IR so if any R is over 100*7/8=87.5Ω it will experience a voltage drop of over 100V.

1. 👍 0
2. 👎 0
2. E = 240 Volts
R1 = 30 Ohms
R2 = 80 Ohms
R3 = 100 Ohms

I = E/(R1+R2+R3) = 240/210 = 1.143A

V1 = I*R1 = 1.143 * 30 = 34.3 V.

V2 = I*R2 = 1.143 * 80 = 91.4 V.

V3 = I*R3 = 1.143 * 100 = 114.3 V.

The voltage across R3 is higher than the rated voltage.

1. 👍 1
2. 👎 0

## Similar Questions

A total resistance of 3 ohms is to be producd by combining an unknown resistor R with a 12 ohm resistor. What is the value of R and how is it connected to the 12 ohm resistor a) 4.0 ohm parallel b) 4.0 ohm in series c) 2.4 ohm in

asked by susane on March 28, 2007
2. ### Science

One light bulb in a string of lights goes out this causes all other lights in string to go out. This is example of A. Resistor B. parallel circuit C. Closed circuit***** D. Series circuit When a switch is turned from the off to

asked by BUBBLES on March 1, 2015
3. ### electrical year 2

how do i answer this. A series RL circuit contains two resistors and two inductors.the resistors are 33 ohms and 47 ohms the inductors have inductive reactances of 60 ohms and 30 ohms. the applied voltage is 120 v. what is the

asked by Dan on October 23, 2017
4. ### physics

Resistors R1, R2, and R3 have resistances of 15.0 Ohms, 9.0 Ohms and 8.0 Ohms respectively. R1 and R2 are connected in series, and their combination is in parallel with R3 to form a load across a 6.0-V battery. -What is the total

asked by Rony on February 18, 2010
5. ### physics

Calculate the resistance of a 900 watt toaster operating at 120 volts. a) R= 10 ohms b) R=120 ohms c) R= 16 ohms d) R=1.6 ohms

asked by Thomas on March 12, 2012
1. ### physics

We are given an input current Iin=100μA and a linear resistive load represented by the resistor RL . Our resistive load is not regulated for the high current provided by our current source, so we add a resistor RS in parallel to

asked by Amit on September 14, 2014
2. ### calculus

Part of a circuit has two resistors connected in parallel as shown in the figure. R(1) is a constant resistor of 10 ohm, while R(2) is a variable resistor with resistance that varies at a rate of 2 ohms per minute. The total, or

asked by NEED HELP NOW! on July 29, 2011
3. ### physics

a metal wire has a resistance of 8 Ohms at a temperature of 20 degrees. if the same wire has a resistance of 8.40 Ohms at 70 degrees. What is the resistance of this wire in Ohms when its temperature is -10 degree celsius

asked by Anton on November 13, 2013
4. ### Circuits2

Three impedances zL=3+j4 ohms, zC=4-j4 ohms and zR=0+j3 ohms are connected in parallel. solve for the power factor of the combination.

asked by Student on March 5, 2018
5. ### science

Calculate the resistance in a circuit in which a 9-volt battery produces 3 amperes. A)3 ohms B)6 ohms C)9 ohms D)27 ohms

asked by Lizette on October 12, 2007
6. ### Physics

The heating element of a simple heater consists of a 2.2m--long, 0.70mm--diameter nichrome wire. When plugged into a 120 V outlet, the heater draws 7.5 A of current when hot. I found that the wire's resistance when it was hot was

asked by Kayla on October 21, 2011