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3 July, 09:03

A nightlight uses 4.0W of power when plugged into an outlet. The current of the circuit is. 034A. What is the voltage across the light bulb's filament?

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  1. 3 July, 11:02
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    Voltage V = 117.65 volts

    the voltage across the light bulb's filament is 117.65 V

    Explanation:

    The power of a light bulb can be expressed with respect to voltage and current flow.

    Power = voltage * current

    P = VI

    Making Voltage V the subject of formula;

    V = P/I

    Given;

    Power P = 4.0W

    Current I = 0.034A

    Substituting the given values;

    V = 4/0.034

    V = 117.65 volts
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