1. What is the equivalent resistance of two resistors, R1R_1R1 and
R2R_2R2, connected in parallel?
A. R=R1+R2R = R_1 + R_2R=R1+R2
B. R=R1R2R1+R2R = \frac{R_1 R_2}{R_1 + R_2}R=R1+R2R1R2
C. R=1R1+R2R = \frac{1}{R_1 + R_2}R=R1+R21
D. R=R1+R22R = \frac{R_1 + R_2}{2}R=2R1+R2
Answer: b) R=R1R2R1+R2R = \frac{R_1 R_2}{R_1 +
R_2}R=R1+R2R1R2
Rationale: The formula for two resistors in parallel is
1Req=1R1+1R2\frac{1}{R_{eq}} = \frac{1}{R_1} +
\frac{1}{R_2}Req1=R11+R21, which simplifies to R=R1R2R1+R2R
= \frac{R_1 R_2}{R_1 + R_2}R=R1+R2R1R2.
2. In a parallel circuit, if the resistance of one resistor is increased, the
total current in the circuit will:
A. Decrease
B. Increase
C. Stay the same
D. Become zero
Answer: b) Increase
,Rationale: In a parallel circuit, adding resistance to one path increases
the total resistance slightly, but the current tends to increase because
other paths for current are available.
3. Which of the following circuits can be used to measure current?
A. Parallel circuit
B. Series circuit
C. Open circuit
D. Closed circuit
Answer: b) Series circuit
Rationale: In a series circuit, current is the same throughout, so it is
easy to measure at any point in the circuit.
4. In an AC circuit, the voltage and current are both:
A. Constant
B. Zero
C. Alternating
D. Always in phase
Answer: c) Alternating
Rationale: In an alternating current (AC) circuit, both the voltage and
current continuously change direction, hence they are alternating.
5. What does the term "AC" stand for in electrical systems?
, A. Alternating Capacitor
B. Alternating Current
C. Automated Current
D. Analog Circuit
Answer: b) Alternating Current
Rationale: AC stands for Alternating Current, which is the type of
current that reverses direction periodically.
6. Which of the following materials is an insulator?
A. Copper
B. Aluminum
C. Rubber
D. Silver
Answer: c) Rubber
Rationale: Rubber is an insulator because it resists the flow of
electricity, unlike copper or aluminum, which are conductors.
7. What type of current is typically used in homes and offices?
A. Direct Current (DC)
B. Alternating Current (AC)
C. Pulsating Direct Current
D. Static Current
R2R_2R2, connected in parallel?
A. R=R1+R2R = R_1 + R_2R=R1+R2
B. R=R1R2R1+R2R = \frac{R_1 R_2}{R_1 + R_2}R=R1+R2R1R2
C. R=1R1+R2R = \frac{1}{R_1 + R_2}R=R1+R21
D. R=R1+R22R = \frac{R_1 + R_2}{2}R=2R1+R2
Answer: b) R=R1R2R1+R2R = \frac{R_1 R_2}{R_1 +
R_2}R=R1+R2R1R2
Rationale: The formula for two resistors in parallel is
1Req=1R1+1R2\frac{1}{R_{eq}} = \frac{1}{R_1} +
\frac{1}{R_2}Req1=R11+R21, which simplifies to R=R1R2R1+R2R
= \frac{R_1 R_2}{R_1 + R_2}R=R1+R2R1R2.
2. In a parallel circuit, if the resistance of one resistor is increased, the
total current in the circuit will:
A. Decrease
B. Increase
C. Stay the same
D. Become zero
Answer: b) Increase
,Rationale: In a parallel circuit, adding resistance to one path increases
the total resistance slightly, but the current tends to increase because
other paths for current are available.
3. Which of the following circuits can be used to measure current?
A. Parallel circuit
B. Series circuit
C. Open circuit
D. Closed circuit
Answer: b) Series circuit
Rationale: In a series circuit, current is the same throughout, so it is
easy to measure at any point in the circuit.
4. In an AC circuit, the voltage and current are both:
A. Constant
B. Zero
C. Alternating
D. Always in phase
Answer: c) Alternating
Rationale: In an alternating current (AC) circuit, both the voltage and
current continuously change direction, hence they are alternating.
5. What does the term "AC" stand for in electrical systems?
, A. Alternating Capacitor
B. Alternating Current
C. Automated Current
D. Analog Circuit
Answer: b) Alternating Current
Rationale: AC stands for Alternating Current, which is the type of
current that reverses direction periodically.
6. Which of the following materials is an insulator?
A. Copper
B. Aluminum
C. Rubber
D. Silver
Answer: c) Rubber
Rationale: Rubber is an insulator because it resists the flow of
electricity, unlike copper or aluminum, which are conductors.
7. What type of current is typically used in homes and offices?
A. Direct Current (DC)
B. Alternating Current (AC)
C. Pulsating Direct Current
D. Static Current
