EEET2249 Circuit Theory Week 4
Ideal Independent Voltage and Current Sources
Q1
In the circuits shown in Fig.Q1(a) & Q1(b), calculate the power absorbed by the three circuit elements. ( The voltage source, current source and the resistor.) Confirm that your answers satisfy the principle of conservation of energy.
| Fig Q1 a
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Fig Q1 b
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(Ans: (a) PI = -60 W, PV = +15 W, PR = +45 W.(b) PI = -10 W, PV = -6 W, PR = +16 W.)
Q2
(a) determine the ammeter and voltmeter readings.
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A = 2 A |
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(b) What are the power supplied by the sources and the power absorbed by the resistor?
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Sources
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Resistors
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(Ans: (a) -2 A, 20 V, (b) Current source supplies 40 W; Voltage source absorbs 24 W; and the resistor absorbs 16 W.)
Q3
In the circuits shown in Fig.Q3, determine the current flowing through the voltage source and the voltage across the current source. Mark your reference direction of the current and the voltage polarities. Hence calculate the power supplied by both sources and the power absorbed by the two resistors.
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Assume Leaving Node #2
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(Ans: IV = 2 A down, 34 V, top+, Power supplied by V source = -36 W, Power supplied by I source = +136 W, Power absorbed by 4 Ω and 9 Ω are 64 W and 36 W respectively.)
Q4
In the circuit shown in Fig.Q4, calculate the source current iS. Check the power balance in the circuit.
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[Ans: iS = 0.5 A; Power absorbed, P16V =-8 W, P4Ω = 1 W, Pcont= 7 W]
Q5
In the circuit shown in Fig.Q5, calculate the currents supplied by the independent and dependant voltage sources.
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Mesh Currents
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Find Currents
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[Ans: iS = 2 A, iY = -1 A]
Q6
In the circuit shown in Fig.Q6,
Calculate the independent
source voltage.
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Calculate KCL
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[Ans: VS = 18 V]
Q7
In the circuit shown in Fig.Q7, calculate the current IS of the independent current source.
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[Ans: IS = 1 A]
Q8
In the circuit shown in Fig.Q8, determine the voltmeter reading. Pay attention to the + polarity of the voltmeter.
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Calculate Resistor Voltages
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Calculate Voltmeter Difference
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(Ans: +4 V)
Q9
In the circuit shown in Fig.Q9, determine the voltage across the current source and the ammeter reading.
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(Ans: 9 V, 3 A)
Q10
In the circuit shown in Fig.Q10, calculate (a) the voltage across the 24 Ω resistor, (b) the current flowing into the 9 Ω resistor and (c) the current flowing into the 4 Ω resistor.
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Solve Currents
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Solve Currents Contd.
Solve Voltages
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(Ans: (a) 24 V, (b) 2 A, (c) 1.5 A )
Q11
In the circuit shown in Fig.Q11, calculate the current supplied by the 40 V source.
(Ans: 2 A)
Tags: Circuit Theory, independent current source, independent voltage source, Physics, resistors, solutions, tutorial