Question

19. Find the current in a circuit if the power is 500 W (watts) and the resistance is 25 ohms. Round off your answer to two decimal places. Use the formula . A. 4.47 A B. 0.22 A C. 20 A D. 0.05 A

Answer 1

A

Explanation:

The formula that relates current, power and resistance is

`I=\sqrt{(P)/(R)}`

Where

I is the current (in amperes)

P is the power (in watts)

R is the resistance (in ohms)

We know P = 500 and R = 25, we plug them into the formula and solve for I:

`I=\sqrt{(P)/(R)}\\I=\sqrt{(500)/(25)}\\I=√(20)\\ I=4.47`

Correct answer is 4.47 Amperes, or choice A.