Question Part Points Submissions Used Tim is using a cordless electric weed trim

Question

Question Part Points Submissions Used Tim is using a cordless electric weed trimmer with a dc motor to cut the long weeds in his back yard. The trimmer generates a back emf of 18.00 V when it is connected to an emf of 23.0 V dc. The total electrical resistance of the electric motor is 7.20 ?. (a) How much current flows through the motor when it is running smoothly? A (b) Suddenly the string of the trimmer gets wrapped around a pole in the ground and the motor quits spinning. What is the current through the motor when there is no back emf? A

Explanation / Answer

a)

current = (23-18)/7.2 = 0.694 A

b)

current = 23/7.2 = 3.19 A

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