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Question
Wires of copper and nichrome of same length are given as shown below. Which among these will produce maximum heat when connected to identical power supply?
(Here A represents the cross-sectional area of the wires.)
Wires of copper and nichrome of same length are given as shown below. Which among these will produce maximum heat when connected to identical power supply?
(Here A represents the cross-sectional area of the wires.)
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Solution
The correct option is D
Wire S
The heating effect of electric current depends on the material of the wire, length of the wire, and thickness of the wire as follows:
(i) Material of the wire: Nichrome wire offers more hindrance to the flow of charges as compared to copper wire when connected to same power supply so nichrome wire produce more heat than the copper wire of the same dimensions.
(ii) Length of the wire: Long wire will get more heated because of the fact that the longer the wire, the more will be the hindrance to the electric current passing through it.
(iii) Thickness of the wire: Thick wire or wire having more cross-sectional area will make it easier for electric current to pass through it. Therefore, the thicker wire will produce less heat as compared to the thinner wire.
Here all the wires have equal length but made up of different materials. The heat generation will be maximum in wire which is thinnest and is made up of nichrome.
Therefore, wire S will produce maximum heat when connected to identical power supply.
Wire S
The heating effect of electric current depends on the material of the wire, length of the wire, and thickness of the wire as follows:
(i) Material of the wire: Nichrome wire offers more hindrance to the flow of charges as compared to copper wire when connected to same power supply so nichrome wire produce more heat than the copper wire of the same dimensions.
(ii) Length of the wire: Long wire will get more heated because of the fact that the longer the wire, the more will be the hindrance to the electric current passing through it.
(iii) Thickness of the wire: Thick wire or wire having more cross-sectional area will make it easier for electric current to pass through it. Therefore, the thicker wire will produce less heat as compared to the thinner wire.
Here all the wires have equal length but made up of different materials. The heat generation will be maximum in wire which is thinnest and is made up of nichrome.
Therefore, wire S will produce maximum heat when connected to identical power supply.
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