PHY_121-POWER_IN_AC_CIRCUIT_(1)[1].pdf

# PHY_121-POWER_IN_AC_CIRCUIT_(1)[1].pdf - So far so good...

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ringbutton3 So far so good we’ve looked at circuits that contain only resistance, inductance or capacitance. However we also mentioned that circuits cannot, in practice, be solely inductive. Therefore we must take account of circuits that have resistance and inductance and we can represent a coil as a pure inductor in series with a resistor

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(a) The resistive and inductive circuit; (b) the phasor parallelogram; (c) the phasor triangle; (d) the wave diagram. Note that i and v are not plotted on the same scale.
Simple trigonometry also applies, so that: For a resistor, the effect limiting the current:

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ringbutton3 For a pure inductor, the effect limiting current is In a circuit that has both resistance and inductance, both effects contribute to limiting the voltage, and:
ringbutton3 For an AC circuit, the ratio U/I is know as impedance (Z) which has the units of ohms (Ω). The impedance in ohms may be defined as the applied voltage in volts needed to drive a current of one ampere. Therefore:

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The impedance for resistive and inductive AC series circuit s.
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