Circuit Theorems Model(1st)

Referring to the given circuit, the voltage and current for the load resistor, RL, is
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1 Mark(s)

4.50 V, 4.5 mA
450 mV, 4.5 mA
450 mV, 45 mA
4.50 V, 45 mA

You cannot convert a voltage source to an equivalent current source, or vice versa.

1 Mark(s)

False
True

A 120 Ω load is connected across an ideal voltage source with VS = 12 V. The voltage across the load is

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120 V
12 V
0 V
Cannot be determined

What is the Thevenin equivalent (V_TH and RTH) for the circuit given?
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1 Mark(s)

6.4 V, 560 Ω
6.4 V, 422 Ω
6.4 V, 680 Ω
30 V, 422 Ω

An 18 V source has an internal resistance of 70 Ω. If a load resistance of 33 Ω is connected to the voltage source, the load power, PL, is

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0 W
175 mW
18 mW
1 W

Some circuits require more than one voltage or current source.

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True
False

A practical current source has a finite internal resistance.

1 Mark(s)

False
True

A 12 V source has an internal resistance of 90 Ω. If a load resistance of 20 Ω is connected to the voltage source, the load power, PL, is

1 Mark(s)

2.38 W
2.38 mW
238 mW
23.8 W

In a two-source circuit, one source acting alone produces 12 mA through a given branch. The other source acting alone produces 10 mA in the opposite direction through the same branch. The actual current through the branch is

1 Mark(s)

22 mA
12 mA
2 mA
10 mA

Find the current in R2 of the given circuit, using the superposition theorem.
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1 Mark(s)

50 mA
33.3 mA
16.6 mA
16.7 mA

The Thevenin equivalent voltage (V_TH) is the short-circuit voltage between two terminals in a circuit.

1 Mark(s)

False
True

A 120 V voltage source has a source resistance, RS, of 60 Ω. The equivalent current source is

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4 A
200 mA
400 mA
2 A

A 120 Ω load is connected across a voltage source with VS = 12 V and RS = 8 Ω. The voltage across the load is

1 Mark(s)

12 V
0 V
11.25 V
1.13 V

Conversions between delta-type and wye-type circuit arrangements are useful in certain specialized applications.

1 Mark(s)

False
True

A 680 Ω load resistor, RL, is connected across a constant current source of 1.2 A. The internal source resistance, RS, is 12 kΩ. The load current, RL, is

1 Mark(s)

1.2 A
1.14 A
114 mA
0 A

Referring to the given circuit, determine V_TH and RTH if a 68 Ω resistor is connected in parallel across R2 and R3.
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1 Mark(s)

330 mV, 148 Ω
3.3 V, 68 Ω
330 mV, 68 Ω
3.3 V, 148 Ω

Find the current through R2 of the given circuit.
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1 Mark(s)

74 mA
30.7 mA
134 mA
104 mA

A 470 Ω RL is connected across a voltage source, VS, of 120 V. The source's internal resistance, RS, is 12 Ω. What is the output voltage across the load?

1 Mark(s)

12 V
120 V
0 V
117 V

Find the current through R1 in the given circuit.
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1 Mark(s)

0.16 A
0.2 A
0.04 A
0.24 A

Find the Thevenin equivalent (V_TH and RTH) between terminals A and B of the circuit given.
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1 Mark(s)

5.62 V, 167 Ω
5.62 V, 188 Ω
562 mV, 188 Ω
562 mV, 167 Ω

Norton's equivalent current (IN) is an open-circuit current between two points in a circuit.

1 Mark(s)

False
True

Find the total current through R3 in the given circuit.
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1 Mark(s)

1.8 mA
7.3 mA
12.8 mA
5.5 mA

An ideal voltage source has zero internal resistance.

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True
False

Find the Norton circuit, that is, IIN and RN, for the circuit given below.
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1 Mark(s)

478 mA, 12.8 Ω
478 mA, 6.8 Ω
750 mA, 6.8 Ω
750 mA, 12.8 Ω

Find RN for the circuit given.
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1 Mark(s)

120 Ω
154 Ω
68 Ω
34 Ω

A 12 mA current source has an internal resistance, RS, of 1.2 kΩ. The equivalent voltage source is

1 Mark(s)

144 V
72 mV
14.4 V
7.2 V

Transistors act basically as voltage sources.

1 Mark(s)

True
False

A certain current source has the values IS = 4 µA and RS = 1.2 MO. The values for an equivalent voltage source are

1 Mark(s)

4.8 V, 4.8 MΩ
4.8 V, 1.2 MΩ
4.8 µV, 1.2 MΩ
1 V, 1.2 MΩ

Referring to circuit given, if R1 is changed to a 68 Ω resistor, what will be the current through it?
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1 Mark(s)

0.16 A
0.2 A
0.24 A
0.04 A

Determine IN for the circuit consisting of VS, R1, R2, and R3 shown in the given circuit.
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1 Mark(s)

431 mA
75 mA
245 mA
676 mA

A certain voltage source has the values VS = 30 V and RS = 6 Ω. The values for an equivalent current source are

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5 A, 6 Ω
5 A, 30 Ω
30 A, 6 Ω
30 A, 5 Ω

A practical voltage source has a nonzero internal resistance.

1 Mark(s)

True
False

Find the Thevenin equivalent (V_TH and RTH) between terminals A and B of the circuit given below.
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1 Mark(s)

41.67 V, 70 Ω
4.16 V, 70 Ω
41.6 V, 120 Ω
4.16 V, 120 Ω

A 2 Ω RL is connected across a voltage source, VS, of 110 V. The source's internal resistance is 24 Ω. What is the output voltage across the load?

1 Mark(s)

8.5 V
110 V
85 V
0 V

An ideal current source has zero internal resistance.

1 Mark(s)

False
True

Circuit Theorems Model(1st) : Question 1 of 35