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Unformatted text preview: generator-like behavior by producing an induced emf, called a back emf or counter emf . Mutual induction Mutual induction is the effect in which a changing current in a primary coil induces an emf in a secondary coil. Self-induction Self-induction is the effect in which a change in current in a coil induces an emf in the same coil. A transfomer A transfomer is a device for increasing or decreasing an ac voltage. Transfomer property A transfomer that steps up the voltage simultaneously steps down the current, and a transformer that steps down the voltage steps up the current. The capacitive reactance V rms = I rms *X C The capacitive reactance - X C is measured in ohms and determines how much rms-current exist in a capacitor in response to a given rms-voltage across the capacitor. 1 of 1 5/16/09 12:51 PM...
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- Fall '08
- RICHARDSON, B