Question

(a)What is heating effect of current? List two electrical appliances which work on this effect.
(b)An electric bulb connected to a 220V generator. If the current drawn by the bulb is 0.50 A find its power
(c)An electric refrigerator rated 400W operates 8 hours a day. Calculate the energy per day in kWh.
(d)State the difference between kilowatt and kilowatt hour. 5​

Answer 1

Answer:

(a)

When electric current flows through a substance for a period of time , the temperature of the substance increases . The phenomenon of increase in temperature or genaration of heat in a substance when electric current

flows through it is called heating effect of current.

— Two electrical appliances which work on this effect are - 1. It is used in lighting appliances like electric bulb and incandescent lamps.

2. Heating effect of current is also used in heating appliances such as immersion rods , electric irons, etc.