Give two ways that a potential difference is induced on a conductor?
⚫️Conductor moving relative to a magnetic field
⚫️ Magnetic field around the conductor changing
1 of 18
what is another name for the generator perfect
electromagnetic induction
2 of 18
how can the direction of an induced potential difference or current be reversed?
⚫️ reverse the movement of the conductor or magnet
⚫️ reverse the polarity of the magnet
3 of 18
what affect the size of an induced potential difference or current?
⚫️speed of movement
⚫️strength of the magnetic field
⚫️number of turns in a coil
4 of 18
how does an alternator make use of generator affect?
produces alternating current
5 of 18
which kind of current is produced by the generator effect in a dynamo ?
direct current
6 of 18
how does a dynamo keep the current flowing in the same direction ?
A split-ring commutator makes the end of the coil swap contacts with the circuit every half term
7 of 18
when is the induced potential difference produced by the alternator at its maximum?
when the plane of the coil lies parallel to the magnetic field lines
8 of 18
How does a microphone use the generator effect?
Convert pressure variations in sound waves into variations in electrical current
9 of 18
what does a transformer do?
Changes the magnitude of the alternating potential difference
10 of 18
What does a basic transformer consist of?
two coils of wire wound around an iron core.
11 of 18
Why is iron used for the core of a transformer?
Iron is easily magnetised and demagnetised
12 of 18
How does a transformer work?
alternating potential difference across the primary coil produces an alternating magnetic field in the iron core which induces an alternating potential difference in the secondary coil.
13 of 18
how is the ratio of potential difference across the primary coil and secondary coil related to the ratio of the number of turns on each coil?
the ratios are the same
Vp/Vs = Np/Ns
14 of 18
which type of transformer has more turns on a secondary coil than on its primary coil ?
step-up transformer
15 of 18
what is the efficiency of a transformer if the power output from the secondary coil is the same as the power input to the primary coil?
100%
16 of 18
what does the split-ring communicator do?
makes the end of the coil swap contacts with the circuit every half turn
17 of 18
which type of transformer has fewer turns on the secondary coil than on the primary coil
step down transformer
18 of 18
Other cards in this set
Card 2
Front
what is another name for the generator perfect
Back
electromagnetic induction
Card 3
Front
how can the direction of an induced potential difference or current be reversed?
Back
Card 4
Front
what affect the size of an induced potential difference or current?
Back
Card 5
Front
how does an alternator make use of generator affect?
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