E5B: Time constants and phase relationships: R/L/C time constants: definition; time constants in RL and RC circuits; phase angle between voltage and current; phase angles of series and parallel circuits
E5B01:
What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the supply voltage?
One time constant
An exponential rate of one
One exponential period
A time factor of one
E5B02:
What is the term for the time it takes for a charged capacitor in an RC circuit to discharge to 36.8% of its initial value of stored charge?
One time constant
One discharge period
An exponential discharge rate of one
A discharge factor of one
E5B03:
The capacitor in an RC circuit is discharged to what percentage of the starting voltage after two time constants?
13.5%
86.5%
63.2%
36.8%
E5B04:
What is the time constant of a circuit having two 220-microfarad capacitors and two 1-megohm resistors all in parallel?
220 seconds
55 seconds
110 seconds
440 seconds
E5B05:
How long does it take for an initial charge of 20 V DC to decrease to 7.36 V DC in a 0.01-microfarad capacitor when a 2-megohm resistor is connected across it?
0.02 seconds
0.04 seconds
20 seconds
40 seconds
E5B06:
How long does it take for an initial charge of 800 V DC to decrease to 294 V DC in a 450-microfarad capacitor when a 1-megohm resistor is connected across it?
450 seconds
4.50 seconds
9 seconds
900 seconds
E5B07:
What is the phase angle between the voltage across and the current through a series R-L-C circuit if XC is 500 ohms, R is 1 kilohm, and XL is 250 ohms?
14.0 degrees with the voltage lagging the current
68.2 degrees with the voltage leading the current
14.0 degrees with the voltage leading the current
68.2 degrees with the voltage lagging the current
E5B08:
What is the phase angle between the voltage across and the current through a series R-L-C circuit if XC is 100 ohms, R is 100 ohms, and XL is 75 ohms?
14 degrees with the voltage lagging the current
14 degrees with the voltage leading the current
76 degrees with the voltage leading the current
76 degrees with the voltage lagging the current
E5B09:
What is the relationship between the current through and the voltage across a capacitor?
Current leads voltage by 90 degrees
Voltage and current are in phase
Voltage and current are 180 degrees out of phase
Voltage leads current by 90 degrees
E5B10:
What is the relationship between the current through an inductor and the voltage across an inductor?
Voltage leads current by 90 degrees
Current leads voltage by 90 degrees
Voltage and current are 180 degrees out of phase
Voltage and current are in phase
E5B11:
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?
14 degrees with the voltage leading the current
14 degrees with the voltage lagging the current
76 degrees with the voltage lagging the current
76 degrees with the voltage leading the current
E5B12:
What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 75 ohms, R is 100 ohms, and XL is 50 ohms?
14 degrees with the voltage lagging the current
76 degrees with the voltage lagging the current
14 degrees with the voltage leading the current
76 degrees with the voltage leading the current
E5B13:
What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 250 ohms, R is 1 kilohm, and XL is 500 ohms?
14.04 degrees with the voltage leading the current
81.47 degrees with the voltage lagging the current
81.47 degrees with the voltage leading the current
14.04 degrees with the voltage lagging the current
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