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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
1 A = _________ mA
- 102
- 103
- 10-3
- 10-6
What is the current in a circuit if the charge passing each point is 20 C in 40 s?
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.
Name two devices which work on the heating effect of electric current.
State three factors on which the heat produced by an electric current depends. How does it depend on these factors?
What would be the danger involved in replacing a blown fuse with the one which would carry a large current?
A 3 pin mains plug is fitted to the lead for a 1 kW electric kettle to be used on a 250 V A.C. supply. Which of the following statements is NOT correct?
(a) A 13 A fuse is the most appropriate value to use.
(b) The brown wire should be connected to the live side of the mains.
An electric bulb is rated '100 W, 250 V'. How much current will the bulb draw if connected to a 250 V supply?
True or False – If False give the correct answer
The representation of the electric current is A
