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Basic Electrical
Schaum's Outline of Basic Electricity
510 SOLVED PROBLEMS
Question: 19.SP.9
A RC series circuit with a square-wave input is shown (Fig. 19-15). The input is a periodic train of pulses with an amplitude of 10 V and a width of 1 ms, with each pulse generated every 2 ms. Plot the output voltage curve across the resistor. ...
Verified Answer:
T=R C=\left(1 \times 10^3\right)\left(0.1 \...
Question: 19.SP.8
A RC series circuit with a rectangular pulse input is shown (Fig. 19-13). A rectangular pulse is a special case of a constant dc source because the voltage is a constant V when the pulse is on and a constant zero when the pulse is off. If a single pulse is applied to the circuit, find the voltage ...
Verified Answer:
Find the time constant of the circuit.
T=R ...
Question: 19.SP.7
A simple switching circuit for producing a sawtooth wave is shown (Fig. 19-12a). The switch S is closed and then opened very quickly so that the capacitor is not fully charged but only charged to the linear portion of its charging exponential curve (Fig. 19-12b). (The linear portion is the ...
Verified Answer:
Write the voltage formula for charging the capacit...
Question: 19.SP.6
For the circuit shown (Fig. 19-11), a 40-μF capacitor is added across the 20-μF capacitor in the circuit of Fig. 19-10. Find the time constant of this circuit and the voltage across this circuit 3 s after the start of charge. ...
Verified Answer:
Find the total capacitance for two capacitors in p...
Question: 19.SP.5
For a RC series circuit (Fig. 19-10), find (a) the time constant of the circuit; (b) vC and vR one time constant after the switch is closed and at 5 s, and (c) vC and vR one time constant after discharge starts, assuming the capacitor is fully charged to 10 V. ...
Verified Answer:
(a) Write Eq. (19-23) for the time constant in a R...
Question: 19.SP.4
A RL circuit (Fig. 19-9) is used to generate a high voltage to light a neon bulb, which requires 90 V for ionization at which time it glows. When the circuit is open, the high resistance R2 produces a low time constant L/R so that the current drops toward zero much faster than the rise of current ...
Verified Answer:
(a) The time constant is the ratio of total induct...
Question: 19.SP.3
In the circuit shown (Fig. 19-8), find (a) the total inductance and (b) the time constant. Assume that a current of 10 A is flowing when the switch S is opened. Find (c) the current 2 s later. ...
Verified Answer:
(a) Reduce the series-parallel combination .of ind...
Question: 19.SP.2
A RL series circuit has the following values: V = 75 V dc, R = 50 Ω, and L = 15 H. (a) Find the time constant. (b) How long after the circuit is energized will the current reach a steady value? (c) What is the steady-state value of current? ...
Verified Answer:
(a) Write the formula for the time constant, Eq. (...
Question: 19.SP.1
A series circuit contains a resistance of 20 Ω and an inductance of 10 H connected across a voltage source of 110 V. (a) What is the current 1 s after the circuit is closed? (b) What are vR and vC at this time? Some time after the current reaches a steady value, the switch is opened. When the ...
Verified Answer:
(a) Step 1. Write the formula for charging or risi...
Question: 19.12
If a RC circuit has a time constant of 1 s, how long will it take for vR to drop from 100 to 50 V? ...
Verified Answer:
Write the time equation for voltage decay, Eq. (19...
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