Explain why, tungsten is used for making the filaments of electric bulbs.

A resistance of 40 ohms and one of 60 ohms are arranged in series across 220 volt supply. Find the heat in joules produced by this combination of resistances in half a minute.

Why is an electric light bulb not filled with air? Explain why argon or nitrogen is filled in an electric bulb.

Explain why, the current that makes the heater element very hot, only slightly warms the connecting wires leading to the heater.

When a current of 4.0 A passes through a certain resistor for 10 minutes, 2.88 x 10⁴ J of heat are produced. Calculate:

(a) the power of the resistor.

(b) the voltage across the resistor.