to a 110V supply. At a temperature of 18°C, the current drawn is 0.575 A. After running the machine for some time the current has fallen to 0.475 A, the voltage remaining unchanged. Calculate the temperature of the winding under the new conditions, assuming that the temperature coefficient of resistance of copper is 0.004 26/C at 0°C.

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The field winding of a d.c. motor is connected
to a 110V supply. At a temperature of 18°C,
the current drawn is 0.575 A. After running the
machine for some time the current has fallen
to 0.475 A, the voltage remaining unchanged.
Calculate the temperature of the winding
under the new conditions, assuming that
the temperature coefficient of resistance of
copper is 0.004 26/°C at 0°C.
Transcribed Image Text:The field winding of a d.c. motor is connected to a 110V supply. At a temperature of 18°C, the current drawn is 0.575 A. After running the machine for some time the current has fallen to 0.475 A, the voltage remaining unchanged. Calculate the temperature of the winding under the new conditions, assuming that the temperature coefficient of resistance of copper is 0.004 26/°C at 0°C.
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