Question

What is the current when a 90-W light bulb is connected to 120 V?

Answer 1

0.75 Amps

Step-by-step explanation

Given:

• The power of the light bulb, P = 90 W

,

• The voltage of the source, V = 120 V

Find:

• The current through the light bulb, I

The power of a device, P, is related to the voltage, V, and current, I, through the following equation,

`P=V\cdot I`

Solving for I,

`I=(P)/(V)`

Substitute the known values and solve,

`I=(90W)/(120V)=(3)/(4)Amps=0.75Amps`

Hence, the current through the light bulb is 0.75 Amps.