using the motor effect.

Question 1

where does the current in the coil flow and what it create/ cause?

Answer 1

opposite directions. force on each side in opposite directions cause turning affect armature rotates.

Question 2

how could you make the rotor turn quicker?

Answer 2

increase strength of magnetic field.
increase current.
more turns in coil.

Question 3

what does the split ring commutator do and what does it ensure?

Answer 3

reverses current round coil every half turn.
coil is always pushed in the same direction.

Question 4

how does a moving coil loudspeaker work?

Answer 4

electrical signal applied to coil.
produces changing magnetic field around coil.
interacts with permanent magnets magnetic field.
produces force acts on cone making it move.