Q. According to Kirchhoff's Current Law (KCL), what is the sum of currents entering a junction?
A.
Equal to the sum of currents leaving the junction
B.
Always zero
C.
Equal to the voltage at the junction
D.
Dependent on the resistance at the junction
Show solution
Solution
KCL states that the total current entering a junction must equal the total current leaving that junction.
Correct Answer:
A
— Equal to the sum of currents leaving the junction
Learn More →
Q. If a circuit has a total power of 100 watts and operates at 10 volts, what is the current?
A.
10 A
B.
5 A
C.
15 A
D.
20 A
Show solution
Solution
Using the power formula P = V * I, we can rearrange it to find I = P / V. Thus, I = 100 W / 10 V = 10 A.
Correct Answer:
B
— 5 A
Learn More →
Q. In a DC circuit, if the voltage is doubled and the resistance remains constant, what happens to the current?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
According to Ohm's Law (V = I * R), if voltage (V) is doubled and resistance (R) is constant, the current (I) must also double.
Correct Answer:
A
— It doubles
Learn More →
Q. In an AC circuit, what is the impedance if the resistance is 4 ohms and the reactance is 3 ohms?
A.
5 ohms
B.
7 ohms
C.
1 ohm
D.
12 ohms
Show solution
Solution
Impedance (Z) in an AC circuit is calculated using the formula Z = √(R^2 + X^2). Here, Z = √(4^2 + 3^2) = √(16 + 9) = √25 = 5 ohms.
Correct Answer:
A
— 5 ohms
Learn More →
Q. What does Kirchhoff's Voltage Law (KVL) state?
A.
The sum of all voltages around a closed loop is zero
B.
The sum of currents entering a junction is zero
C.
Voltage is constant in a series circuit
D.
Power is conserved in a circuit
Show solution
Solution
KVL states that the sum of the electrical potential differences (voltages) around any closed network is zero.
Correct Answer:
A
— The sum of all voltages around a closed loop is zero
Learn More →
A.
V = I * R
B.
P = V * I
C.
I = V / R
D.
R = V / I
Show solution
Solution
Ohm's Law states that the voltage (V) across a conductor is directly proportional to the current (I) flowing through it, with the resistance (R) being the constant of proportionality.
Correct Answer:
A
— V = I * R
Learn More →
Q. What is the equivalent resistance of two resistors in series, R1 and R2?
A.
R1 + R2
B.
R1 * R2 / (R1 + R2)
C.
1 / (1/R1 + 1/R2)
D.
R1 - R2
Show solution
Solution
The equivalent resistance of resistors in series is simply the sum of their resistances: R_eq = R1 + R2.
Correct Answer:
A
— R1 + R2
Learn More →
Q. What is the formula for calculating power in an electrical circuit?
A.
P = V * I
B.
P = I / R
C.
P = V / I
D.
P = R * I^2
Show solution
Solution
Power (P) in an electrical circuit can be calculated using the formula P = V * I, where V is voltage and I is current.
Correct Answer:
A
— P = V * I
Learn More →
Q. What is the Norton equivalent of a circuit?
A.
A single current source and parallel resistance
B.
A single voltage source and series resistance
C.
A complex network of capacitors
D.
A combination of inductors and resistors
Show solution
Solution
The Norton equivalent of a circuit is represented by a single current source in parallel with a resistance.
Correct Answer:
A
— A single current source and parallel resistance
Learn More →
Q. What is the Thevenin equivalent of a circuit?
A.
A single voltage source and series resistance
B.
A single current source and parallel resistance
C.
A combination of capacitors and inductors
D.
A complex network of resistors
Show solution
Solution
The Thevenin equivalent of a circuit is represented by a single voltage source in series with a resistance.
Correct Answer:
A
— A single voltage source and series resistance
Learn More →
Showing 1 to 10 of 10 (1 Pages)
