Term
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Definition
| Difficult to magnetise and de-magnetise |
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Term
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Definition
| Easy to magnetise and de-magnetise |
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Term
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Definition
| Area where a magnet would feel a force |
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Term
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Definition
| Shows direction of magnetic field from N to S. Field lines close together where field is strong |
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Term
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Definition
| A magnetic material is magnetised by being placed in a magenetic field |
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Term
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Definition
| Current-carrying coil of wire with soft magetic core. |
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Term
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Definition
| Another name for a current carrying coil |
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Term
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Definition
| A current carrying wire in a magnetic field feels a force. Used in loudspeakers and motors. |
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Term
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Definition
| Increased by larger current, stronger magnet, more coils |
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Term
| Electromagnetic induction |
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Definition
| A changing magnetic field through a conductor will induce a voltage. |
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Term
| Increasing electromagnetic induction |
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Definition
| Faster movement, stronger magnet, more coils |
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Term
| Left hand rule for motors |
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Definition
First finger = Field
SeCond finger = Current
ThuMb = Motion |
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Term
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Definition
| Device producing induced voltage when coil spins in magnetic field or vice versa |
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Term
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Definition
| Device which allows AC voltage to be stepped up or down |
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Term
| High voltage transmission because... |
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Definition
| energy losses are high with high current, so must step-up voltage (and step-down current) with a transformer |
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Term
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Definition
| Constantly changing size and direction. Necessary for transformers. |
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Term
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Definition
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Term
| Transformer power equation |
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Definition
Power in = Power out
VpIp = VsIs |
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Term
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Definition
| Same poles repel; opposite poles attract |
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