If the current flowing through a fixed resistor is halved, the heat produced in it will become:

In a filament type light bulb, most of the electric power consumed appears as :

Which of the following is the most likely temperature of the filament of an electric light bulb when it is working on the normal 220 V supply line?

The electrical resistivities of four materials P, Q, R and S are given below :

P - 6.84 × 10^-8 Ω m

Q - 1.70 × 10^-8 Ω m

R - 1.0 × 10¹⁵ Ω m

S - 11.0 × 10^-7 Ω m

Which material will you use for making:

(a) heating element of electric iron

(b) connecting wires of electric iron

(c) covering of connecting wires? Give reason for your choice in each case.

How does the wire in the filament of a light bulb behave differently to the other wires in the circuit when the current flows ?