Question

An electric lamp is marked 60w 240v. If it operates at 200v the current through it will be

Answer 1

current through the electric lamp is 0.2083 A

Answer 2

The current through it will be 0.208 A.

Explanation:

It is given that,

Electric power, P = 60 W

Voltage, V = 240 V

If R is the resistance of the electric bulb. Power is given by :

$P=\dfrac{V^2}{R}$

$R=\dfrac{V^2}{P}$

$R=\dfrac{(240)^2}{60}$

R = 960 ohms

If the operating voltage is 200 V. We need to find the current through it. It can be calculated using Ohms law.

$V=IR$

$I=\dfrac{V}{R}$

$I=\dfrac{200\ V}{960\ \Omega}$

I = 0.208 A

So, the current through it will be 0.208 A.

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