Question

An electric lamp uses energy at the rate of 48 w on a 12 v supply. How much charge passes through the lamp in 2.0 seconds ?

Answer 1

power is equal to voltage × current. therefore current is 4 ampere . therefore using charge is time x current therefore charge is 8 Coloumb

Answer 2

Answer:

Charge, q = 8 Coulombs

Explanation:

It is given that,

Power of an electric lamp, P = 48 W

Voltage, V = 12 V

Time, t = 2 s

Power is the product of the voltage and the current flowing :

$I=\dfrac{P}{V}$

$I=\dfrac{48\ W}{12\ V}$

I = 4 A

Also, the electric current is the ratio of electric charge and time :

$I=\dfrac{q}{t}$

q = I t

q = 4 A × 2 s

q = 8 C

The charge that is passing through the lamp is 8 Coulombs.

Hence, this is the required solution.