(a) 1 A
(b) 2 A
(c) 4 A
(d) 5 A
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A lamp consumes 1000 J of electrical energy in 10 s. What is its power?
Power is given by the expression, Power=Work done /Time Work done = Energy consumed by the lamp = 1000 J Power=1000 / 10 = 100 Js−1 = 100 W
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Alka was making tea in a kettle. Suddenly she felt intense heat from the puff of steam gushing out of the spout of the kettle.
The temperature of both boiling water and steam is 100°C, but steam has more energy because of latent heat of vapourisation.
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A fuse wire is made of
(B) an alloy of tin and lead Electric fuse wire is an alloy made of tin (63%) & lead (37%). The cross sectional area determines the melting point at a certain...
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An electrician is carrying out some repairs in your house. He wants to replace a fuse by a piece of wire.
Fuse is a device that is a safeguard to all of our electrical appliances. They are made up of special material which melt quickly and break when a large electric...
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How is the strength of the magnetic field at a point near a wire related to the strength of the electric current flowing in the wire?
The magnitude of magnetic field is directly proportional to the strength of the electric current flowing in the wire.
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How is the fuse connected in an electric circuit?
Fuse is connected in series in the circuit.
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Choose the statement which is not correct in the case of an electric fuse.
(c) There is a minimum limit on the current which can safely flow in the electric circuits.
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Define 1 Watt of power. A lamp consumes 1000 J of electrical energy in 10s. Calculate its power
A body is said to have power of 1 watt if it does work at the rate of 1 joule in 1 s, i.e., 1W=1J/1s Power is given by the expression, Power=Work done...
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Calculate the values of effective resistance in each case. (A) What is the function of fuse in an electric circuit?
(A) A fuse wire is a safety wire connected in series with the live wire. Fuse wire melts down in case of supply of large current supply or malfunctioning in the...
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A light source emits monochromatic light of wavelength 555 nm. The source consumes 100 W of electric power
Overall luminous efficiency =Total luminous flux / Power input =35x685/100 = 239.75 lumen/W
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