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Simple harmonic motion

Dynamos in cars

Why AC?

In modern cars and lorries, AC dynamos are used to recharge DC batteries. Why use an AC rather than a DC dynamo?

The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and SQA exam specifications.

The simplest dynamo produces an alternating voltage. It can be adapted to produce DC, or its AC output can be rectified using diodes in a bridge circuit.

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Simple harmonic motion