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A dynamo is not used much on modern cars. It produces a DC current and needs to be turned quite fast. Nowadays they use alternators, and these produce AC current and can producequitea lot at lower revs.Thislatter fact makes them more suitable for modern cars, which have a lot of electrical equipment. As regards power, as you know this is measured inhorsepoweror watts, and a typical car alternatormight have a maximum amperageoutputof 90 amps. This is going to be delivered at say 14 volts. Multiply 14 x 90 = 1,260 watts. There are 746 watts per horsepower, so the answer to your question is 1.7 hp. In fact, there will be some losses, so that the true figure will be somewhat less.

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