1.50 An electric motor draws a current of 10 amperes (A) with a voltage of 110 V. The output shaft develops a torque of 9.5 N·m and a rotational speed of 1000 rpm. All operating data are constant with time. Determine (a) the electric power required by the motor and the power developed by the output shaft, each in kilowatts; (b) the net power input to the motor, in kilowatts; (c) the amount of energy transferred to the motor by electrical work and the amount of energy transferred out of the motor by the shaft in kW.h and Btu, during 2 h of operation. V = 110 V I = 10 A t = 2 hr Output shaft n = 1000 rpm T = 9.5 N.m FIGURE P1.50 Ans. Pin= 1.10 KW, Pout = 0.995 KW, Pnet = 0.105 KW, Ein = 7514 BTU, Eout = 6797 BTU
1.50 An electric motor draws a current of 10 amperes (A) with a voltage of 110 V. The output shaft develops a torque of 9.5 N·m and a rotational speed of 1000 rpm. All operating data are constant with time. Determine (a) the electric power required by the motor and the power developed by the output shaft, each in kilowatts; (b) the net power input to the motor, in kilowatts; (c) the amount of energy transferred to the motor by electrical work and the amount of energy transferred out of the motor by the shaft in kW.h and Btu, during 2 h of operation. V = 110 V I = 10 A t = 2 hr Output shaft n = 1000 rpm T = 9.5 N.m FIGURE P1.50 Ans. Pin= 1.10 KW, Pout = 0.995 KW, Pnet = 0.105 KW, Ein = 7514 BTU, Eout = 6797 BTU
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter2: Matter And Energy
Section: Chapter Questions
Problem 26RQ: How many Btu of heat can be produced by 4 kWh ofelectricity?
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Transcribed Image Text:1.50
An electric motor draws a current of 10 amperes (A) with a voltage of 110 V. The output shaft
develops a torque of 9.5 N·m and a rotational speed of 1000 rpm. All operating data are constant
with time. Determine (a) the electric power required by the motor and the power developed by the
output shaft, each in kilowatts; (b) the net power input to the motor, in kilowatts; (c) the amount
of energy transferred to the motor by electrical work and the amount of energy transferred out of
the motor by the shaft in kW.h and Btu, during 2 h of operation.
V = 110 V
+
I= 10 A
t = 2 hr
Output
shaft
n = 1000 rpm
T= 9.5 N.m
FIGURE P1.50
Ans. Pn = 1.10 KW, Pout = 0.995 KW, Pnet = 0.105 KW, Ein = 7514 BTU, Eout = 6797 BTU
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