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प्रश्न
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उत्तर
Watt-hour is the commercial unit of electrical energy.
One watt-hour is the electrical energy consumed by an electrical appliance of power 1 watt when it is used for 1 hour.
1Wh = 3600 J
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संबंधित प्रश्न
What actually travels through the wires when you switch on a light?
Consider the circuit given below when A, B and C are three identical light bulbs of constant resistance. 
(a) List the bulbs in order of increasing brightness.
(b) If C burns out, what will be the brightness of A now compared with before?
(c) If B burns out instead, what will be the brightness of A and C compared with before?
Two lamps, one rated 40 W at 220 V and the other 60 W at 220 V, are connected in parallel to the electric supply at 220 V.
(a) Draw a circuit diagram to show the connections.
(b) Calculate the current drawn from the electric supply.
(c) Calculate the total energy consumed by the two lamps together when they operate for one hour.
Which effect of current is utilised in the working of an electric fuse?
Distinguish between an open and a closed circuit.
What is meant by internal resistance of a cell?
True or False – If False give the correct answer
The representation of the electric current is A
Conventionally, the direction of the current is taken as:
Problems for practice:
If 3A current flows through a circuit, then convert the current in terms of a milliampere.
