Heating Effect Of Current

Heating Effect in Current Electricity

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Heating Effects of current

(a) Derive the expression for the heat produced due to a current 'I' flowing for a time interval 't' through a resistor 'R' having a potential difference 'V' across its ends. With which name is this relation known? (b) How much heat will an instrument of 12W produce in one minute if its is connected to a battery of 12V? (c) The current passing through a room heater has been halved. what will happen to the heat produced by it? (d) What is meant by the heating effect of current? Give two applications of the heating effect of current. (e) Name the material which is used for making the filaments of an electric bulb.

State whether the following statements are ture of false: (a) A wire with a green insulation is usually the live wire. (b) A miniature ciruit breaker (MCB) works on the heating effects of current .

(a) what is menat by the heating effect of current ? State three factors on which the heat produced in a wire by an electric current depends. (b) Explain why, through the heating element of an electric heater glows, but its connecting cord does not l glow. ( c) An electric geyser of resistance 20 Omega takes a current of 5 A. calculate the heat produced in 2 minutes. (d) Name the commercial unit of electric energy. How many joules are equal to this unit ?

While reading about the heating effect of current, Raju list some electrical devices that work on that principle. He lists some devices . His father notices that one device is listed incorrectly. Electrical device: Electric kettle, Motor, Toaster, Geyser, Hair dryer Which device is listed incorrectly by Raju ?

Heating Effect Of Electric Current

Practical Application Of Heating Effect Of Electric Current