Question

How much electricity must flow through a light bulb to do 1 kWh of work? Mains voltage 220 V.

Answer 1

Given:

Energy = 1 kWh

Voltage = 220 Volts

Let's find the amount of electric current that must flow through the light bulb.

To find the amount of electric current, apply the formula:

`P=IV`

Where:

P is the power in watts = 1 kWh = 1000 Watts

V is the voltage = 200 V

I is the electric current.

Rewrite the formula for I and solve:

`\begin{gathered} I=(P)/(V) \\ \\ I=(1000)/(220) \\ \\ I=4.5\text{ A} \end{gathered}`

Therefore, the amount of electric current that must flow through the light bulb is 4.5 Ampere

ANSWER:

4.5 A