... rotate a coil in a magnetic field. As coil spins, a current is induced, and changes direction every half turn. Contacts don't swap every half turn as they have slip rings and brushes instead of split ring commutators. They produce alternating PD
Generators
1 of 8
... work the same way as generators but have a split ring commutator instead of slip rings and brushes. This swaps connection every half-turn, so there is a DC and not an AC
Dynamos
2 of 8
... show how the PD generated changes over time. For AC, the PD is positive and negative. For DC, the PD is positive only. The height of line is the generated PD and increasing frequency, increases the overall PD
Oscilloscopes
3 of 8
... are loudspeakers in reverse. Sound waves hit the flexible diaphragm attached to a coil of wire, wrapped around a magnet. This causes a wire to move in magnetic field and generates a current. Movement of coil depends on properties of sound waves
Microphones
4 of 8
... change the size of the PD for an alternating current. They have primary and secondary coils of wire, joined with an iron core. The alternating PD is applied across primary coil, iron core magnetises and demagnetises quickly and then to secondary
Transformers
5 of 8
... transformer: Increases the PD. They have more turns on secondary coil than primary coil
Step up
6 of 8
... transformer: Decreases the PD. They have more turns on primary coil than secondary coil
Step down
7 of 8
Transformers are almost 100% ...
efficient
8 of 8
Other cards in this set
Card 2
Front
... work the same way as generators but have a split ring commutator instead of slip rings and brushes. This swaps connection every half-turn, so there is a DC and not an AC
Back
Dynamos
Card 3
Front
... show how the PD generated changes over time. For AC, the PD is positive and negative. For DC, the PD is positive only. The height of line is the generated PD and increasing frequency, increases the overall PD
Back
Card 4
Front
... are loudspeakers in reverse. Sound waves hit the flexible diaphragm attached to a coil of wire, wrapped around a magnet. This causes a wire to move in magnetic field and generates a current. Movement of coil depends on properties of sound waves
Back
Card 5
Front
... change the size of the PD for an alternating current. They have primary and secondary coils of wire, joined with an iron core. The alternating PD is applied across primary coil, iron core magnetises and demagnetises quickly and then to secondary
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