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:

$\begin{gathered} I=\frac{P}{V} \\ \\ I=\frac{1000}{220} \\ \\ I=4.5\text{ A} \end{gathered}$

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

ANSWER:

4.5 A