A 120-Ω laboratory resistor is rated at 0.25 W. How much current can safely flow through the resistor?

0.0436 A

Explanation:

Current: This can be defined as the rate of flow of electric charge in a circuit. The S.I unit of current is Ampere (A).

The expression of current is given as

P = I²R

Where P = power, I = current, R = Resistance.

Make I the subject of the equation,

I = √(P/R) Equation 1

Given: P = 0.25 W, R = 120 Ω

Substitute into equation 1

I = √(0.25/120)

I = √(0.00208)

I = 0.0456 A.

Hence the current that can safely pass through the resistor = 0.0436 A

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