EEE 360 MIDTERM 2 FULL SOLUTION STUDY
GUIDE
◉ Complex Power (VA)
Answer: S = V_rms x I*_rms;
S = P + jQ
the rating of power equipment is described by the apparent power,
S, also measured in volt-amperes
P = real power
Q = reactive power
◉ In this circuit, the current lags the applied voltage
Answer: inductive
◉ In this circuit, the current leads the applied voltage
Answer: capacitive
◉ Resistor real power equation
Answer: S_R = V_R x I*
, ◉ Capacitive reactive power [negative] equation
Answer: S_C = V_C x I*
◉ Voltage source complex power equation
Answer: S_S = V_S x I*
◉ Voltage regulation
Answer: The difference between the magnitudes of the voltage at the
load terminals for the no-load (V_no-load) and (full) load conditions
divided by the load voltage (V_load) magnitude
◉ Voltage regulation generalizations
Answer: Typically, the voltage regulation should be less than 10%.
Overvoltage in no-load condition must be less than 5%.
The voltage drop in full load condition should not be more than -5%.
◉ Loads
Answer: Are represented by an impedance
Z = V_load / I_load = R + jX
◉ Lagging
Answer: The phase angle is positive if the load power factor is?
GUIDE
◉ Complex Power (VA)
Answer: S = V_rms x I*_rms;
S = P + jQ
the rating of power equipment is described by the apparent power,
S, also measured in volt-amperes
P = real power
Q = reactive power
◉ In this circuit, the current lags the applied voltage
Answer: inductive
◉ In this circuit, the current leads the applied voltage
Answer: capacitive
◉ Resistor real power equation
Answer: S_R = V_R x I*
, ◉ Capacitive reactive power [negative] equation
Answer: S_C = V_C x I*
◉ Voltage source complex power equation
Answer: S_S = V_S x I*
◉ Voltage regulation
Answer: The difference between the magnitudes of the voltage at the
load terminals for the no-load (V_no-load) and (full) load conditions
divided by the load voltage (V_load) magnitude
◉ Voltage regulation generalizations
Answer: Typically, the voltage regulation should be less than 10%.
Overvoltage in no-load condition must be less than 5%.
The voltage drop in full load condition should not be more than -5%.
◉ Loads
Answer: Are represented by an impedance
Z = V_load / I_load = R + jX
◉ Lagging
Answer: The phase angle is positive if the load power factor is?
