In the context of GCSE exams, how should I decide whether a particular question is about the motor effect or about electromagnetic induction?
The motor effect causes a force to occur EM induction causes a current to occur when a force is applied
Look at the question: is there a battery⟹ motor effect if there are obvious force arrows ⟹ induction
If they have actually drawn out a motor/generator then the only way to tell is by whether the question says a current is flowing or whether it says steam/whatever is pushing around the loop. Someone will have to back me up on this, but I think DC motors have split rings, while generators have slip rings.
Finally, its horrendously unlikely that this would be useful in an exam, but you could put in a really sensitive ammeter and work out whether the current flowing is AC/DC.
Someone will have to back me up on this, but I think DC motors have split rings, while generators have slip rings..
Yep, pretty sure I've heard this as well. Motors require the polarity to be reversed every half turn, while generators simply require a constant connection.