$1 \; kWh = \ldots \ldots \ldots \; \text{watt-seconds}$

Name a few practical applications of the heating effect of current.

An electric heater of resistance $8 \, \Omega$ draws $15 \, A$ from the service mains for $2$ hours. Calculate the rate at which heat is developed in the heater (in $W$).

State the factors on which the heat produced in a current-carrying conductor depends. Give one practical application of this effect.

Which of the following terms does not represent electrical power in a circuit?

Which alloy is used to make the heating element (resistance wire) in an electric iron?