An electric heater a current of `5 A` and its element has a resistance of `50 Omega`. If the heater is switched on for `5` minutes, calculate the energy released in kilojoules.

An electric room heater has a resistance of 25 Omega and operates at 220 V for 12 minutes. Calculate heat energy dissapated by it in kilojoules.

A torch bulb of 3 V draws a current of 0.4 A . If the bulb is switched on for 5 minutes, calculate the energy released by the bulb.

An electric heater draws a current of 5 A when connected to 220 V mains. Calculate the resistance of its filament.

An electric heater is rated 1000 W - 200 V. Calculate the resistance of the heating element.

Power of an electric heater is 1000 W and it is run for 1 hour. Calculate the energy consumed by it.

An electric heater coils is connect to a 220 V source. If the resistance of the heater coil is 220 ohm. Find the current.

An electric heater coil if connected to a 230 V source if the resistance of the heater coil is 220 ohm. Find the current.

(a) what is menat by the heating effect of current ? State three factors on which the heat produced in a wire by an electric current depends. (b) Explain why, through the heating element of an electric heater glows, but its connecting cord does not l glow. ( c) An electric geyser of resistance 20 Omega takes a current of 5 A. calculate the heat produced in 2 minutes. (d) Name the commercial unit of electric energy. How many joules are equal to this unit ?

A current of 5.0 A flows through an electric press of resistance 11Omega . Calculate the energy consumed b the press in 5 minutes.