Ok, basic revision - what three things increase the strength any electromagnet ?
Coils, current and core
1 of 10
In the motor effect... 1______ generates 2_______
1current 2movement
2 of 10
Put these in the correct order for how the motor effect works: a)the wire experiences a force b)when current flows through the wire it forms a magnetic field c)the wire coil rotates d) the magnetic field of the wire interacts with the permanent magnetic f
B,d,a,c
3 of 10
A _______ in a simple electric motor reverses the current and so keeps the wire/magnet spinning in one direction.
Spilt ring commutator
4 of 10
A generator uses...
A.C current
5 of 10
One purpose of brushes in a generator circuit is...
To ensure the circuit remains complete
6 of 10
TRANSFORMERS! p.d in primary/1____ = 2____/turns in secondary
1p.d in secondary 2turns in primary
7 of 10
Transformers - If there are more turns in the primary than in the secondary coil, it is a ______ transformer
Step-down
8 of 10
Out these in order for how a transformer works: a)Induces an a.c current in the secondary coil b)creates a continually changing magnetic field in the iron core c)a.c p.d in primary coil d)a.c current flows
C,d,b,a
9 of 10
Flemings left/right hand rule - left hand is for 1____, right hand is for 2_____
1motors 2generators
10 of 10
Other cards in this set
Card 2
Front
In the motor effect... 1______ generates 2_______
Back
1current 2movement
Card 3
Front
Put these in the correct order for how the motor effect works: a)the wire experiences a force b)when current flows through the wire it forms a magnetic field c)the wire coil rotates d) the magnetic field of the wire interacts with the permanent magnetic f
Back
Card 4
Front
A _______ in a simple electric motor reverses the current and so keeps the wire/magnet spinning in one direction.
In the motor effect, the direction of the force on the wire is reversed if the direction of the current and the direction of the magnetic field are both reversed
^ That question is true, because both of those factors do reverse the force. From the Left hand rule, remember?
nishat, it's false because 2 factors are changed in which therefore causes no change in the direction of the force. its like having two minuses which would make a plus, whilst if you had one minus it would remain a minus. therefore, if only say the direction of the current is changed then the force on the wire would be reversed :)
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