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Resistance wire is sometimes arranged in a ziz zag pattern. To get the required length of wire for a given resistance, it takes up room and also gives out heat. If it were wound closely, it woould overheat and burn up. The zig zag pattern makes sure that air can pass aound easily, keeping the temperature within limits. Whether that is intentional heat, as in a 'heater' or consequential, as in a motor control resistance, the arrangement is the same.

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