Answer to Question #151100 in Physics for Mr. Blue

Question

If three resistors connected in series to a battery. Suppose R1 carries a current of 17A, R2 has a resistance of 20Ω, and R3 dissipates 85W of power. What is the voltage across R3 and Resistance of R3 ?

1. Voltage (in V) across R3 =


and

2. Resistance (in Ω) of R3 =

Answer 1

The voltage across R₃:

$$V=P/I=85/17=5\text{ V}.$$

Resistance of this resistor:

$$R=V/I=5/17=0.29\space\Omega.$$