An electric press is rated '750 W, 230 V'. Calculate the electrical energy consumed by the press in 16 hours.

An electrical appliance having a resistance of 200 Ω is operated at 200 V. Calculate the energy consumed by the appliance in 5 minutes (i) in joule, (ii) in kWh

A current of 0.2 A flows through a wire whose ends are at a potential difference of 20 V. Calculate —

(i) the resistance of the wire, and

(ii) the heat energy produced in 1 minute.

What is the resistance, under normal working conditions, of an electric lamp rated at '240 V, 60 W'? If two such lamps are connected in series across a 240 V mains supply, explain why each one appears less bright.