Question

A resistor has a potential difference of 16.5 V across it. It develops thermal energy at 340 W. What is the current across the resistor?

Answer 1

The current across the resistor is 20.61A

Step-by-step explanation:

The power P can be expressed as a function of the potential difference V using the equation;

P = IV

Where;

P = power

I = current

V = potential difference.

Making current I the subject of formula;

I = P/V

Given;

V = 16.5V

P = 340 W

Substituting the values;

I = 340W/16.5V

Current I = 20.61A

Answer 2

i=20.61apms

Step-by-step explanation:

Power=340W

And a P.D=16.5V

Power in electric circuit is

P=iV

Therefore,

i=V/P

i=340/16.5

i=20.61amps