Q. According to Kirchhoff's Current Law (KCL), what must be true at a junction?
A.
The sum of voltages is zero
B.
The sum of currents entering equals the sum of currents leaving
C.
The total power is conserved
D.
The total resistance is constant
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Solution
KCL states that the sum of currents entering a junction must equal the sum of currents leaving that junction.
Correct Answer:
B
— The sum of currents entering equals the sum of currents leaving
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Q. According to Kirchhoff's Voltage Law (KVL), the sum of the voltages around a closed loop is equal to what?
A.
Zero
B.
The total current
C.
The total resistance
D.
The power consumed
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Solution
KVL states that the sum of the electrical potential differences (voltages) around any closed network is zero.
Correct Answer:
A
— Zero
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Q. In a circuit with a 12V battery and a 4Ω resistor, what is the current flowing through the resistor?
A.
3A
B.
4A
C.
12A
D.
0.33A
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Solution
Using Ohm's Law, I = V / R = 12V / 4Ω = 3A.
Correct Answer:
A
— 3A
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Q. In a series circuit, if one resistor fails open, what happens to the current?
A.
It increases
B.
It decreases
C.
It becomes zero
D.
It remains the same
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Solution
In a series circuit, if one resistor fails open, the entire circuit is interrupted, and the current becomes zero.
Correct Answer:
C
— It becomes zero
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Q. What is the equivalent resistance of a 5 ohm and a 10 ohm resistor in series?
A.
15 ohms
B.
5 ohms
C.
10 ohms
D.
50 ohms
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Solution
In series, the total resistance is the sum of the individual resistances: R_total = R1 + R2 = 5 ohms + 10 ohms = 15 ohms.
Correct Answer:
A
— 15 ohms
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Q. What is the equivalent resistance of two resistors, 4Ω and 6Ω, in series?
A.
10Ω
B.
24Ω
C.
2.4Ω
D.
0.67Ω
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Solution
In series, the equivalent resistance is simply the sum of the resistances: 4Ω + 6Ω = 10Ω.
Correct Answer:
A
— 10Ω
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Q. What is the formula for calculating power in a DC circuit?
A.
P = V / I
B.
P = I^2 * R
C.
P = V * I
D.
P = R / V
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Solution
The power (P) in a DC circuit can be calculated using the formula P = V * I, where V is voltage and I is current.
Correct Answer:
C
— P = V * I
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Q. What is the impedance of a capacitor at a frequency of 60 Hz with a capacitance of 10 µF?
A.
2652.58 ohms
B.
26.52 ohms
C.
0.265 ohms
D.
0.0265 ohms
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Solution
The impedance (Z) of a capacitor is given by Z = 1 / (2 * π * f * C). Thus, Z = 1 / (2 * π * 60 * 10e-6) ≈ 265.2 ohms.
Correct Answer:
B
— 26.52 ohms
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Q. What is the impedance of a capacitor at a frequency of 60Hz with a capacitance of 10μF?
A.
2652Ω
B.
0.2652Ω
C.
0.02652Ω
D.
15.9Ω
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Solution
The impedance of a capacitor is given by Z = 1 / (jωC). For 60Hz and 10μF, Z = 1 / (j * 2π * 60 * 10e-6) ≈ 2652Ω.
Correct Answer:
A
— 2652Ω
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Q. What is the Norton equivalent current for a circuit with a 10Ω resistor and a 20V source?
A.
2A
B.
0.5A
C.
20A
D.
10A
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Solution
The Norton equivalent current is the short-circuit current, which can be calculated as I = V / R = 20V / 10Ω = 2A.
Correct Answer:
A
— 2A
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Q. What is the power consumed by a 12 V battery supplying 3 A of current?
A.
36 W
B.
12 W
C.
24 W
D.
48 W
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Solution
Power (P) is calculated using the formula P = V * I. Therefore, P = 12 V * 3 A = 36 W.
Correct Answer:
A
— 36 W
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Q. What is the Thevenin equivalent voltage across a load resistor in a simple circuit?
A.
The open-circuit voltage
B.
The short-circuit current
C.
The total current
D.
The total resistance
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Solution
The Thevenin equivalent voltage is the open-circuit voltage across the load resistor when it is removed from the circuit.
Correct Answer:
A
— The open-circuit voltage
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Q. What is the Thevenin equivalent voltage across a load resistor in a simple circuit with a 12 V source and a 4 ohm resistor in series with a 2 ohm load?
A.
12 V
B.
8 V
C.
6 V
D.
4 V
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Solution
The Thevenin equivalent voltage is the voltage across the load resistor, which can be found using voltage division: V_load = V_source * (R_load / (R_series + R_load)) = 12 V * (2 / (4 + 2)) = 8 V.
Correct Answer:
B
— 8 V
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Q. What is the total resistance in a parallel circuit with two resistors of 4 ohms and 6 ohms?
A.
2.4 ohms
B.
10 ohms
C.
24 ohms
D.
12 ohms
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Solution
The total resistance (R_total) in parallel is given by 1/R_total = 1/R1 + 1/R2. Thus, 1/R_total = 1/4 + 1/6 = 5/12, so R_total = 12/5 = 2.4 ohms.
Correct Answer:
A
— 2.4 ohms
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Q. What is the total resistance in a parallel circuit with two resistors, R1 and R2?
A.
R1 + R2
B.
1 / (1/R1 + 1/R2)
C.
R1 * R2 / (R1 + R2)
D.
R1 - R2
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Solution
The total resistance in a parallel circuit is given by the formula 1 / (1/R1 + 1/R2).
Correct Answer:
B
— 1 / (1/R1 + 1/R2)
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Q. What is the voltage across a 10 ohm resistor carrying a current of 2 A?
A.
5 V
B.
10 V
C.
20 V
D.
15 V
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Solution
Using Ohm's Law, V = I * R = 2 A * 10 ohms = 20 V.
Correct Answer:
C
— 20 V
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