Assume that a motor in which the coil has a total resistance of 40 Ohm is suppli

Question

Assume that a motor in which the coil has a total resistance of 40 Ohm is supplied voltage of 120 V. When the motor is running at its maximum speed, the back emf is 40 is 4 V. What is the power? Answer: What is the power when the motor is running at one-half the maximum speed? Answer: 10. Find the magnetic energy stored in the air gap between two very large magnetic pole pices, one North, one South , each with an area of 100 cm^2. Assume the 0.04 T magnetic field is uniform within the 3-cm gap Answer:

Explanation / Answer

As per guide lines i am working first problem

the power of a motor is

P = V^2/ R = ( 120 V)^2 / 40 ohm = 360 W

when the motor is running at one half of maximum speed, the power of motor is

P = V^2/ r = ( V- back emf)^2/ R = ( 120 - 40 V)^2/ 40 ohm = 160 W

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