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PHYSICS

JAMB 2021 - Question 23

Physics 2021 JAMB Past Questions - Question 23: A 60W and a 120W domestic lamp are used on the 240V mains, which of the following statement is correct?

Choose the correct answers from the options given.

A 60W and a 120W domestic lamp are used on the 240V mains, which of the following statement is correct?

A: the filament of the 120W lamp has a higher resistance than that of the 60W lamp

B: the total current through the mains is 1 ampere

C: the potential difference across each lamp is 120V

D: the filament of the 60W lamp has a higher resistance than that of the 120W lamp.

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Correct Answer

Explanation

The power consumed by a device can be calculated using the formula P = V x I, where P is power in watts, V is voltage in volts, and I is current in amperes. Using this formula, we can find the current drawn by each lamp.

For the 60W lamp:
P = V x I
60W = 240V x I
I = 60W / 240V
I = 0.25A

For the 120W lamp:
P = V x I
120W = 240V x I
I = 120W / 240V
I = 0.5A

So, the correct statement is that the 60W lamp draws 0.25A of current, and the 120W lamp draws 0.5A of current from the 240V mains.