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​

Respuesta :

Answer:

The resistance of the lamp is 960 ohms.

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 :

[tex]P=\dfrac{V^2}{R}[/tex]

R is resistance

[tex]R=\dfrac{V^2}{P}\\\\R=\dfrac{(240)^2}{60}\\\\R=960\ \Omega[/tex]

So, the resistance of the lamp is 960 ohms.