Find the current in a circuit if the power is 500 W (watts) and the resistance is 25 ohms. Round off

Question

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 I = √p/r.

A. 0.05 A

B. 20 A

C. 0.22 A

D. 4.47 A

Answer 1

The underlying formula that you want to use here is

I = sqrt(P/R) , where I is the current, P is the power, and R is the resistance

If you apply the given formula to this set of variable values you end up with

I = sqrt(500/25) = sqrt(20) = 4.4721

meaning that the current flowing in the circuit is 4.47A

Answer 2

Here is the formula you are required to use:

Current = √( Power / Resistance)

You are given:

Power = 500 W

Resistance = 25 ohms

Substituting into the equations gives:

Current = √( Power / Resistance) = √(500 W / 25 ohms) = √(20 A) ≈ 4.47 A

Answer: D