250 Chapt. 33 Alternating Current or AC a) I0 V0 ; φ b) V0 I0 ; φ c) V0 I0 ; ωt d) V0 I0 ; ω e) I0 V0 ; ω 033 qmult 00240 1 1 2 easy memory: AC power, phase angle 12. For a circuit branch (which could be a device or circuit system), you have potential drop/rise across and current through given by, respectively, V = V0 cos( ωt ) and I = I0 cos( ωt − φ ) . The time-average power output/input of the branch is given by: a) P = I0 V0 . b) P = I rms V rms cos( φ ), where φ is the phase di±erence between potential and current. c) P = I rms V rms . d) P = I0 V0 cos( φ ), where φ is the phase di±erence between potential and current. e) P = I rms /V rms . 033 qmult 00242 1 1 4 easy memory: phase angle of an AC circuit 13. The time-average power supplied by a AC emf is 100 W. The RMS potential rise and currents for the device are, respectively 20 V and 10 A. What is the phase angle? a) 0 ◦ . b) 30 ◦ . c) 45 ◦ . d) 60 ◦ . e) 90 ◦ . 033 qmult 00250 1 1 1 easy memory: resistor impedance
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This note was uploaded on 11/16/2011 for the course PHY 2053 taught by Professor Buchler during the Fall '06 term at University of Florida.