26 - LCR Circuits - Physics 212 LCR Circuits Fall 2009...

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Physics 212 Fall 2009 LCR Circuits 10/28/2009
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Summary Magnetic flux change is the same due to iron core N S >N P - step up; N S <N P - step down V S = N S N P V p I P V P = I S V S I S = I P V P V S = I P N P N S Step up the voltage and step down the current keep power constant V = V 0 sin( ω t ) Average Power RMS (Root-Mean-Square) V RMS , I RMS AC Voltage P AVG = 1 2 I 0 2 R I RMS = I 0 2 ω = 2 π f f = 1 T ω = 2 π T
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Transformer The ac adapter for a laptop computer contains a transformer. The input of the adapter is the 120 volts from the ac wall outlet. The output from the transformer is 20 volts. What is the turns ratio of the transformer? a) 0.17 b) 6 c) 100 d) This cannot be determined without knowing how many turns one of the coils in the transformer has.
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What is a Phasor? Vector that rotates about the origin - represents oscillating quantities Angular speed - rotation speed is equal to oscillation angular frequency ω Length - size of the vector represents the amplitude of the alternating quantity Projection - projection onto vertical axis is the instantaneous value at time (t) Rotation Angle - Phase of the quantity at time (t)
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