Question

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?

Answer 1

Voltage V = 117.65 volts

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

Step-by-step 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