1.

An electric bulb is connected to a 220 V generator. The current is 0.5 A. What is the power of the bulb ?

Answer»

Solution :(a)The heating effect of electric current is used in the following applications.
Electric bulb : In an electric bulb, the filament of bulb gives light because of heating effect of electricity. The filament of bulb is generally MADE of tungsten METAL, having melting point equal to `3380^@C.`
Electric iron : The element of electric iron is made of alloys having high melting point. Electric heater and GEYSER work on the same mechanism.
Given V = 220 , I = 0.5 A, P = ?
P = VI
` = 220 V xx 0.50A `
= 110 J/S
= 110 W


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