A 7.00-Ω resistor is dissipating 70.0 watts.What are the current through it and the potential difference across it?
A)10.0 A,22.1 V
B)22.1 A,3.16 V
C)3.16 A,22.1 V
D)3.16 A,10.0 V
E)10.0 A,70.0 V

Question

Quizplus · Accepted Answer

We can use the formula for power, P = I^2*R, where P is power, I is current, and R is resistance.

Using this formula, we can rearrange it to solve for current:

I = sqrt(P/R)

Plugging in the values given in the problem, we get:

I = sqrt(70/7) = sqrt(10) = 3.16 A

To find the potential difference (voltage) across the resistor, we can use another formula:

V = I*R

Plugging in the values, we get:

V = 3.16*7 = 22.1 V

Therefore, the correct choice is C, with a current of 3.16 A and a potential difference of 22.1 V.

A 700-Ω Resistor Is Dissipating 70