Resistance in an AC circuit

Resistance in an AC circuit - Resistance in an AC circuit...

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Resistance in an AC circuit The relationship V = IR applies for resistors in an AC circuit, so In AC circuits we'll talk a lot about the phase of the current relative to the voltage. In a circuit which only involves resistors, the current and voltage are in phase with each other, which means that the peak voltage is reached at the same instant as peak current. In circuits which have capacitors and inductors (coils) the phase relationships will be quite different. Capacitance in an AC circuit Consider now a circuit which has only a capacitor and an AC power source (such as a wall outlet). A capacitor is a device for storing charging. It turns out that there is a 90° phase difference between the current and voltage, with the current reaching its peak 90° (1/4 cycle) before the voltage reaches its peak. Put another way, the current leads the voltage by 90° in a purely capacitive circuit. To understand why this is, we should review some of the relevant equations,
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This note was uploaded on 11/22/2011 for the course PHY PHY2053 taught by Professor Davidjudd during the Fall '10 term at Broward College.

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Resistance in an AC circuit - Resistance in an AC circuit...

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