Question

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​

Answer 1

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.