Physics I HATE THIS SHIT

Question 1

Induced e.m.f.

Answer 1

whenever there is relative movement between the conductor
and a magnetic field

Question 2

Factors that will increase the induced e.m.f. are:

Answer 2

moving the magnet faster through the coil

adding more turns to the coil

increasing the strength of the bar magnet

Question 3

a.c. generators

Answer 3

An a.c. generator is a device which converts energy
from motion into an electrical output

An alternating e.m.f. is generated which causes an alternating
current to flow

Question 4

A simple a.c. generator consists of

Answer 4

a rotating coil of wire between the poles of a permanent magnet

slip rings and brushes connected to an external circuit

Question 5

Factor affecting a.c. generators

Answer 5

increasing the frequency of rotation of the coil

increasing the number of turns on the coil

increasing the strength of the magnet

inserting a soft iron core into the coil

Question 6

Vp/ Vs = Np/Ns

Answer 6

p = primary / input
s = secondary / output

Question 7

100% efficiency

Answer 7

Vp = Is Vs

Question 8

P = I^2 * R

Answer 8

power losses
in cables are smaller when the voltage is greater

Question 9

Step up

Answer 9

increases voltage of the power source, has more turns on the secondary coil than on the primary coil

Question 10

Step down

Answer 10

decreases voltage of power source, less turns on secondary coil than on primary coil