TIME CONSTANT


1. A-001-001-001.... What is the meaning of the term "time constant" in an RL circuit?
the time required for the current in the circuit to build up to 36.8 percent of the maximum value 
the time required for the voltage in the circuit to build up to 63.2 percent of the maximum value 
the time required for the voltage in the circuit to build up to 36.8 percent of the maximum value 
the time required for the current in the circuit to build up to 63.2 percent of the maximum value 
No Answer
2. A-001-001-002.... What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2 percent of the supply voltage?
an exponential rate of one 
one time constant 
a time factor of one 
one exponential period 
No Answer
3. A-001-001-003.... What is the term for the time required for the current in an RL circuit to build up to 63.2 percent of the maximum value?
one time constant 
an exponential period of one 
a time factor of one 
one exponential rate 
No Answer
4. A-001-001-004.... What is the term for the time it takes for a charged capacitor in an RC circuit to discharge to 36.8 percent of its initial value of stored charge?
a discharge factor of one 
an exponential discharge of one 
one time constant 
one discharge period 
No Answer
5. A-001-001-005.... What is meant by "back EMF" ?
a current that opposes the applied EMF 
a voltage that opposes the applied EMF 
an opposing EMF equal to R times C percent of the applied EMF 
a current equal to the applied EMF 
No Answer
6. A-001-001-006.... After two time constants, the capacitor in an RC circuit is charged to what percentage of the supply voltage?
63.2 percent 
86.5 percent 
95 percent 
36.8 percent 
No Answer
7. A-001-001-007.... After two time constants, the capacitor in an RC circuit is discharged to what percentage of the starting voltage?
13.5 percent 
36.8 percent 
86.5 percent 
63.2 percent 
No Answer
8. A-001-001-008.... What is the time constant of a circuit having a 100 microfarad capacitor in series with a 470 kilohm resistor?
4700 seconds 
470 seconds 
0.47 seconds 
47 seconds 
No Answer
9. A-001-001-009.... What is the time constant of a circuit having a 470 microfarad capacitor in series with a 470 kilohm resistor?
221 000 seconds 
47 000 seconds 
221 seconds 
470 seconds 
No Answer
10. A-001-001-010.... What is time constant of a circuit having a 220 microfarad capacitor in series with a 470 kilohm resistor?
470 000 seconds 
470 seconds 
103 seconds 
220 seconds 
No Answer
   

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