piece of resistance wire, 15.6 m long and cross-sectional area 12mm² at a temperature of 0°C, passes a current Of 7.9 A when connected to DC supply at 240V. Calculate (a) resistivity of the wire (b) the current which will flow when the temperature rises to 55°C. The temperature coefficient of the resistance wire at 0°C is 0.00029.

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
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Chapter12: Electronic Control Devices
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A piece of resistance wire, 15.6 m long and cross-sectional area 12mm² at a temperature of 0°C, passes a current Of 7.9 A when connected to DC supply at 240V. Calculate (a) resistivity of the wire (b) the current which will flow when the temperature rises to 55°C. The temperature coefficient of the resistance wire at 0°C is 0.00029.
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