Question

1)Which of the following physical manipulations of a system containing a loop of conductive wire and a magnetic field will result in the creation of electric current, thus transforming mechanical work into electrical energy? NOTE: You must provide an explanation for your answer to receive credit.

a.  Dropping a bar magnet through a loop of wire

b.  Rotating a loop of wire in an external magnetic field (assume the area vector of the loop and the direction of the magnetic field begin parallel)

c.  Pulling a loop of wire in and out of a region with an external magnetic field (assume the area vector of the loop and the direction of the magnetic field are parallel)

d.  Both (a) and (b)

e.  All of the above 2)Explain how practical electric motors are able to produce torque always in the same direction through 360 degrees of rotation of the motor. 3) Knowing that household electrical outlets always have 60 Hz AC, how do you suppose electric power plants increase or decrease the amount of electrical power they produce in response to changing demand, if they can't simply change the speed of their generators?

Answer 1

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