AQA GCSE Physics · 8463
Specification 4.7.3.2 · Paper 2
Revise: Uses of the generator effectThe contacts determine whether this reversal reaches the external circuit as AC or is rearranged to give DC.
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GCSE Physics · key term
Current that flows in only one direction, although its size may vary.
Used by AQA
Specification 4.7.3.2 · Paper 2
Revise: Uses of the generator effectThe contacts determine whether this reversal reaches the external circuit as AC or is rearranged to give DC.
Do not say that a dynamo produces a constant potential difference. A simple dynamo produces varying DC: its polarity stays the same, but its size changes.
On a potential difference–time graph, values on opposite sides of zero have opposite polarities. A trace that never crosses zero represents DC, even if its size varies.
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