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5 Cards in this Set

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  • Back
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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?
Calculate the inductive reactance at the given frequency: XL (inductive reactance) = 2(ᴨ)(freq)(L)
Combine with resistance to get the impedance. Z(imped) = R + jX

answer 40 + j31,400
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?
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
True power
power actually consumed by the circuit
less than apparent power, P = EI
Apparent power
P = EI (often desinated VA - volts/amperes- instead of watts to distinguish from true power
greater than the true power, the power actually consumed by the circuit (because some power is held by capacitors and inductors)
Power factor
ratio of true to apparent power
power factor also = cos θ (the phase angle)