Advertisements
Advertisements
Question
Name the quantity whose unit is (i) kilowatt, and (ii) kilowatt-hour.
Solution
(i) Kilowatt is the unit of power.
(ii) Kilowatt-hour is the unit of energy.
APPEARS IN
RELATED QUESTIONS
Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
What is consumed using different electrical appliances, for which electricity bills are paid?
Why is an electric light bulb not filled with air? Explain why argon or nitrogen is filled in an electric bulb.
Electrical power P is given by the expression P = (Q × V) ÷ time. What do the symbols Q and V represent?
Which cable, one rated 15A and the other rated 5A will be thicker? Give a reason.
‘The current rating of a fuse is 5A’. Comment on this statement.
What is the function of the split rings in a d.c. motor?
Three 250 W heaters are connected in parallel to a 100 V supply, Calculate the energy supply in kWh to the three heaters in 5 hour.
An immersion rod having resistance of 50 Ω is connected to 220V main supply. Assuming that all the energy generated goes to heat the water, calculate the time taken to heat 5 kg water from 30°C to 100°C.
