Physics: Magnetism and Electromagnetism

Question 1

what is the motor effect

Answer 1

conductor and the magnet exert a force on each other causing the wire to move

Question 2

what is the motor effect force equation

Answer 2

F (force) = B (magnetic flux density) x l (current) x 1 (length)

Question 3

what is the Fleming left hand rule

Answer 3

left hand index finger is direction of the magnetic field
left hand second finger is perpendicular and the current
left hand thumb point in direction of force

Question 4

what is the generator effect

Answer 4

induction of a potential difference (and current if there’s a complete circuit) in a wire which is moving relative to a magnetic field, or experiencing a change in magnetic field

Question 5

what happens if you change the magnet in the generator affect

Answer 5

induce and alternating current

Question 6

what do alternators do

Answer 6

generate alternating current by spinning the magnet

Question 7

what do dynamos do

Answer 7

generate direct current by spinning the wire

Question 8

what do transformers do

Answer 8

change the potential difference for alternating current

Question 9

what is the potential difference transformer equation

Answer 9

Vp (input potential difference) / Vs (Output potential difference) = np (number of primary coils) / ns (number of turns on secondary coil)

Question 10

what is the current transformer equation

Answer 10

Vs (Pd across secondary coil) x is (Current through secondary coil) = Vp (Pd across primary coil) x Ip (Current through primary coil