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    I really don't understand AC and DC - I know what they are and have a vague idea of the differences between them but I don't understand what is useful where and why? Like how do you know whether to use an AC or DC supply in a circuit or experiment or whatever? Thanks for your help in advance. x

    AC is a alternating current so it is changing from positive to negative with a chosen interval usually used in motors DC is direct current and is constant current which doesn't change
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