Physics 2009 JAMB Past Questions - Question 41: An electric lamp marked 240 V, 60 W is left to operate for an hour . How much energy is generated by the filament ?

Correct Answer

D

Explanation

To calculate the energy generated by the filament in the electric lamp, you can use the formula for electrical energy:

Energy (in joules) = Power (in watts) x Time (in seconds)

However, you have the power in watts and the time in hours, so you'll need to convert the time to seconds. There are 3600 seconds in an hour.

Given:
Power (P) = 60 watts
Time (T) = 1 hour = 3600 seconds

Now, plug these values into the formula:

Energy (in joules) = 60 watts x 3600 seconds

Energy = 216,000 joules

So, the filament in the lamp generates 216,000 joules of energy when left to operate for an hour.