Question

Aprproximately how much electrical energy does a 5-W lightbulb convert to radiant and thermal energy in one hour

Answer 1

Answer:

Energy, E = 18 kJ

Explanation:

Given that,

Power of the lightbulb, P = 5 W

We need to find the electrical energy produced by the lightbulb in one hour. We know that electric power is given by the electrical energy produced per unit time.

1 hour = 3600 seconds

Electric power :

$P=\dfrac{E}{t}\\\\E=P\times t\\\\E=5\ W\times 3600\ s\\\\E=18000\ J$            

or

E = 18 kJ

So, 18 kJ of electrical energy a 5-W lightbulb convert to radiant and thermal energy in one hour.