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5 Cards in this Set
- Front
- Back
- 3rd side (hint)
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In rectangular coordinates, what is the impedance of a network comprised of a 10-microhenry inductor in series with a 40-ohm resistor at 500 MHz?
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Calculate the inductive reactance at the given frequency: XL (inductive reactance) = 2(ᴨ)(freq)(L)
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Combine with resistance to get the impedance. Z(imped) = R + jX
answer 40 + j31,400 |
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What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 25 ohms, R is 100 ohms, and XL is 50 ohms?
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XL - inductive reactance
XC-capacitive reactance θ - phase angle |
X = XL - XC
θ = arctan X/R positive value = voltage leads current; negative value = voltage lags the current |
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True power
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power actually consumed by the circuit
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less than apparent power, P = EI
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Apparent power
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P = EI (often desinated VA - volts/amperes- instead of watts to distinguish from true power
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greater than the true power, the power actually consumed by the circuit (because some power is held by capacitors and inductors)
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Power factor
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ratio of true to apparent power
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power factor also = cos θ (the phase angle)
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