Chapter 7: Alternating Current
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Transformer core is made of:
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Frequency of generated AC depends on:
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Slip rings are used in:
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In generator, emf is produced due to:
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AC generator converts:
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Efficiency of ideal transformer is:
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Step-down transformer decreases:
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Step-up transformer increases:
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Transformer changes:
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Transformer works on:
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Reactive power =
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True power =
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Apparent power =
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Unit of power is:
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Average power is maximum when:
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Power factor for pure capacitor:
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Power factor for pure inductor:
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Power factor for pure resistor:
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Power factor =
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Power in AC circuit is:
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Wattless current means:
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Power factor at resonance is:
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Phase difference at resonance is:
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In LCR circuit at resonance, current is:
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Resonance frequency:
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At resonance, impedance is:
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At resonance, XL =
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Impedance Z =
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Impedance is:
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Unit of reactance is:
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Capacitive reactance is:
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In capacitor, current leads voltage by:
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Inductive reactance is:
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In pure inductor, current lags voltage by:
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In resistor circuit, phase difference is:
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Peak voltage for 220V supply is:
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RMS voltage of 220V AC is:
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AC frequency in India is:
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Crest factor =
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Form factor =
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RMS current is:
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In AC, current varies:
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AC voltage equation is:
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Time period T is given by:
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Peak value of current is denoted by:
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Angular frequency ω is related to frequency f by:
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The average value of AC over a full cycle is:
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RMS value of AC is equal to:
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The SI unit of frequency is:
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Alternating current changes its direction after every:
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