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Magnetism and Electromagnetism
Quick questions on Electromagnetic induction: N(A)-Level Physics electromagnetism
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is making the induced voltage bigger?Show answer
The induced voltage is larger if the magnetic field through the coil changes faster or by more. You can increase it by:
What is the simple generator?Show answer
A generator turns kinetic energy into electrical energy using induction. A coil is spun in a magnetic field (or a magnet is spun near a coil). As the coil rotates, the magnetic field through it keeps changing, so a voltage is continually induced. This drives a current in the connected circuit.
What are transformers?Show answer
A transformer uses induction to change the size of an alternating voltage. It has two coils wound on the same iron core. An alternating current in the first coil makes a constantly changing magnetic field in the core, which induces a voltage in the second coil.
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