(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 12 W produce in one minute if it is connected to a battery of 12 V ?
(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.

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