Physics
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.
Related Questions
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 bulb rated 12 V, 24 W operates on a 12 volt battery for 20 minutes. Calculate —
(i) the current flowing through it, and
(ii) the energy consumed.
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.
Two bulbs are rated '60 W, 220 V' and '60 W, 110 V' respectively. Calculate the ratio of their resistances.