1. In a resistive circuit, what happens if the voltage is doubled?
A. The current stays the same
B. The current is halved
C. The current doubles
D. The current quadruples
Answer: c) The current doubles
Rationale: According to Ohm’s law, I=VRI = \frac{V}{R}I=RV,
doubling the voltage doubles the current, assuming resistance remains
constant.
2. Which of the following is the correct formula for electrical power?
A. P=V×IP = V \times IP=V×I
B. P=V2×RP = V^2 \times RP=V2×R
C. P=I2×RP = I^2 \times RP=I2×R
D. All of the above
Answer: d) All of the above
Rationale: All three formulas are correct, depending on the known
quantities:
• P=V×IP = V \times IP=V×I
• P=V2RP = \frac{V^2}{R}P=RV2
,• P=I2×RP = I^2 \times RP=I2×R
3. What happens to the power consumed if both voltage and current
are doubled in a circuit?
A. Power remains the same
B. Power doubles
C. Power quadruples
D. Power is halved
Answer: c) Power quadruples
Rationale: Since power is P=V×IP = V \times IP=V×I, doubling both
voltage and current results in a quadrupling of power.
4. 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.
5. What does a step-down transformer do?
, A. Increases voltage
B. Decreases voltage
C. Changes DC to AC
D. Reduces current
Answer: b) Decreases voltage
Rationale: A step-down transformer reduces the voltage from a higher
level to a lower level.
6. Which of the following devices is used to control the flow of current
in a circuit?
A. Resistor
B. Switch
C. Capacitor
D. Inductor
Answer: b) Switch
Rationale: A switch is used to open or close a circuit, controlling the
flow of current.
7. Which of the following components can be used to store electrical
energy?
A. Resistor
B. Capacitor
C. Inductor
A. The current stays the same
B. The current is halved
C. The current doubles
D. The current quadruples
Answer: c) The current doubles
Rationale: According to Ohm’s law, I=VRI = \frac{V}{R}I=RV,
doubling the voltage doubles the current, assuming resistance remains
constant.
2. Which of the following is the correct formula for electrical power?
A. P=V×IP = V \times IP=V×I
B. P=V2×RP = V^2 \times RP=V2×R
C. P=I2×RP = I^2 \times RP=I2×R
D. All of the above
Answer: d) All of the above
Rationale: All three formulas are correct, depending on the known
quantities:
• P=V×IP = V \times IP=V×I
• P=V2RP = \frac{V^2}{R}P=RV2
,• P=I2×RP = I^2 \times RP=I2×R
3. What happens to the power consumed if both voltage and current
are doubled in a circuit?
A. Power remains the same
B. Power doubles
C. Power quadruples
D. Power is halved
Answer: c) Power quadruples
Rationale: Since power is P=V×IP = V \times IP=V×I, doubling both
voltage and current results in a quadrupling of power.
4. 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.
5. What does a step-down transformer do?
, A. Increases voltage
B. Decreases voltage
C. Changes DC to AC
D. Reduces current
Answer: b) Decreases voltage
Rationale: A step-down transformer reduces the voltage from a higher
level to a lower level.
6. Which of the following devices is used to control the flow of current
in a circuit?
A. Resistor
B. Switch
C. Capacitor
D. Inductor
Answer: b) Switch
Rationale: A switch is used to open or close a circuit, controlling the
flow of current.
7. Which of the following components can be used to store electrical
energy?
A. Resistor
B. Capacitor
C. Inductor
