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P10 and P14 (Simple Phenomena Of Magnets (Method of magnetizing (Methods…
P10 and P14
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Transformer
The alternating input voltage produces an AC current in the primary coil, causing a constantly changing the magnetic field in case
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In a step down transformer,there are more turns in the primary coil so output voltage is less than input voltage
In a step down transformer, there are more turns in the secondary coil than in primary coil, which means the input voltage is less than the output voltage
Voltage across secondary coil/ Voltage across the primary coil= turns in secondary coil/ turns in the primary coil
Transformers are often used in power stations (step up transformers). Voltage increases but current decreases. Transferring energy at a low current avoid getting the enrergy lost
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Generator
As the coil spins one side cuts up through the magnetic field lines inducing electromotive force and causing a current to flow.
When the coil reached the vertical position, the side that was cutting up through the field lines now cuts down- induced emf will change direction, and therefore current will change direction
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