electromagnetic induction

Question 1

what is electromagnetic induction?

Answer 1

the creation of potential difference across a conductor which is experiencing a change in magnetic field

Question 2

what happens when you move the magnetic in a coil of a wire/ move electrical conductor in a magnetic field?

Answer 2

creates a current

Question 3

what happens when you move the magnetic in the opposite direction of potential difference?

Answer 3

the potential difference will be reversed

Question 4

what happens if the polarity is reversed?

Answer 4

the potential difference will be reversed

Question 5

what happens when the magnet/coil is moving back and forward?

Answer 5

you produce a potential difference which keeps swapping direction and eventually produces an alternating current

Question 6

dynamos

Answer 6

• used in bikes (power light)
• the cog of a wheel at top
• is positioned so it touches the wheel

Question 7

how do dynamos work?

Answer 7

as wheel moves round it turns the cog attached to the magnet which produces an alternating current