Which among the following systems undergo/s work transfer ?

Which among the following systems undergo/s work transfer?


a. Current flowing through the resistor
b. A shaft rotated by a motor
c. both a. and b.
d. none of the above

Correct Answer : c. both a. and b.

Explanation :

When electric current passes through the resistor, work transfer can takes place. This is because the current can drive a motor and the motor can drive a pulley and this can results in lifting a weight.
When a shaft is rotated by a system, work transfer can takes place into the system. This is because the shaft can rotate a pulley which can lift a weight. Thus both the systems undergo work transfer.
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