Calculate the Current Through a 60 W Lamp Rated 250 V. If the Line Voltage Falls to 200 V, How is Power Consumed by the Bulb Affected?

प्रश्न

Calculate the current through a 60 W lamp rated 250 V. If the line voltage falls to 200 V, how is power consumed by the bulb affected?

बेरीज

उत्तर

Given ,

Power P = 60 W

Voltage , V = 250 V

As Power , P = VI

I = `60/250 = 0.24 "A"`

Resistance of bulb R = `"V"^2/"P" = 250^2/60 = 1041.6 Omega`

Now if voltage falls to 200 V , power consumed will be

P = `"V"^2/"R" = 200^2/1041.6 = 38.4 "W"`

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