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प्रश्न
Define kilowatt-hour.
Define one kilowatt hour.
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उत्तर १
One kilowatt-hour is the amount of electrical energy consumed when an electrical appliance having a power rating of one kilowatt is used for one hour.
उत्तर २
Kilowatt hour is the unit of work.
Since, power × time = work
संबंधित प्रश्न
Define Electric power.
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be ______.
1 kWh = ________ J
An electric kettle for use on a 230 V supply is rated 3000 W. For safe working, the cable connected to it should be able to carry at least:
(a) 2 A
(b) 5 A
(c) 10 A
(d) 15 A
Two bulbs are rated 60 W, 220 V and 60 W, 110 V respectively. Calculate the ratio of their
resistances
Name three main characteristics of an heating element.
What changes in energy occur in an electric heater?
‘The current rating of a fuse is 5A’. Comment on this statement.
A bulb is connected to a battery of e.m.f. 6V and internal resistance 2Ω A steady current of 0.5A flows through the bulb. Calculate the resistance of the bulb.
Compare the power used in the 2 Ω resistor in each of the following circuits:
- a 6 V battery in series with 1 Ω and 2 Ω resistors
- a 4 V battery in parallel with 12 Ω and 2 Ω resistors.
