Question

a light bulb uses electrical energy to generate light. it uses 3 volts of an electric charge and 40 amps of electric current. what is the light bulbs power?
120 watts
120 ohms
120 volts
120 amps

Explanation:

Step1: Recall the power formula

The formula for power \(P\) in an electrical circuit is \(P = VI\), where \(V\) is voltage and \(I\) is current.

Step2: Substitute the given values

Given \(V = 3\) volts and \(I=40\) amps. Substitute into the formula: \(P=(3)(40)\).

Step3: Calculate the power

\(P = 120\) watts. Also, check units: Ohms (\(\Omega\)) is for resistance (\(R=\frac{V}{I}\)), Volts (\(V\)) is for voltage, Amps (\(A\)) is for current, and Watts (\(W\)) is for power.

Answer:

120 Watts