Heat Produced by an electric Current

According to Joule's law , quantity of heat (H) produced by an electric current = …………….. .

Write an expression for the heat produced when an electric current is passed through it.

Name two effect produced by electric current.

(a) How is heat produced in a conductor by an electric current ? (b) What are the factors on which heat produced due to a current flowing through a conductor depend ?

Heat produced in an electric circuit depends upon the potential difference, current and time.

Heat produced in an electric circuit depends upon the potential difference, current and time.

The heat produced by passing an electric current through a fixed resistor is proportional to the square of:

(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 ?

Some of the polar crystals, on heating produce a small electric current called