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21. An electric lamp is marked 2 points

240V, 60W. What is its
resistance (?) when it is
operated at the correct
voltage?
O A. 1/960
O B. 1/4
O 0.4
O D. 960​

1 Answer

3 votes

Answer:

The resistance of the lamp is 960 ohms.

Step-by-step explanation:

We have,

Voltage of electric lamp is 240 V and power is 60 W.

It is required to find the resistance of the lamp.

The power of an electrical device is given by :


P=(V^2)/(R)

R is resistance


R=(V^2)/(P)\\\\R=((240)^2)/(60)\\\\R=960\ \Omega

So, the resistance of the lamp is 960 ohms.

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