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Basic Electricity
Instructions: Choose the best answer for each question.
1. What is electric current measured in?
a) Volts
b) Watts
c) Amperes
d) Ohms
2. Which of the following is a good conductor of electricity?
a) Rubber
b) Wood
c) Copper
d) Plastic
3. What is the unit of electrical resistance?
a) Ampere
b) Volt
c) Ohm
d) Watt
4. What does a battery do in a circuit?
a) Measures current
b) Provides voltage
c) Controls resistance
d) Stops the flow of charge
5. What is voltage often described as?
a) The flow of electric charge
b) The electrical pressure
c) The opposition to current
d) The rate of energy use
6. What is the function of a switch in a circuit?
a) To increase voltage
b) To decrease resistance
c) To open or close the circuit
d) To measure current
7. If you increase the voltage in a circuit, what happens to the current (assuming resistance stays the same)?
a) It increases
b) It decreases
c) It stays the same
d) It stops
8. Which of these materials is a good insulator?
a) Silver
b) Aluminum
c) Glass
d) Gold
9. What is electric power measured in?
a) Amperes
b) Volts
c) Ohms
d) Watts
10. What is the formula for Ohm's Law?
a) P = IV
b) V = IR
c) E = mc²
d) F = ma
11. According to Ohm's Law, if the resistance in a circuit increases, and the voltage stays the same, the current will:
a) Increase
b) Decrease
c) Stay the same
d) Stop completely
12. What is the purpose of a resistor in a circuit?
a) To provide voltage
b) To measure current
c) To limit current flow
d) To store energy
13. What type of circuit has only one path for the current to flow?
a) Parallel circuit
b) Series circuit
c) Short circuit
d) Open circuit
14. In a parallel circuit, what is the same for all components?
a) Current
b) Resistance
c) Voltage
d) Power
15. In a series circuit, what is the same for all components?
a) Current
b) Voltage
c) Resistance
d) Power
16. What happens to the total resistance when you add resistors in series?
a) It increases
b) It decreases
c) It stays the same
d) It becomes zero
17. What happens to the total resistance when you add resistors in parallel?
a) It increases
b) It decreases
c) It stays the same
d) It becomes infinite
18. What is the name for a continuous, unbroken path through which electricity can flow?
a) Insulator
b) Circuit
c) Resistor
d) Voltage
19. Which of these is a safety device designed to protect a circuit from too much current?
a) Resistor
b) Battery
c) Fuse
d) Switch
20. Which of these is used to store electrical energy?
a) Resistor
b) Capacitor
c) Inductor
d) Switch
Answer Key:
1. c
2. c
3. c
4. b
5. b
6. c
7. a
8. c
9. d
10. b
11. b
12. c
13. b
14. c
15. a
16. a
17. b
18. b
19. c
20. b
Instructions: Choose the best answer for each question.
1. What is electric current measured in?
a) Volts
b) Watts
c) Amperes
d) Ohms
2. Which of the following is a good conductor of electricity?
a) Rubber
b) Wood
c) Copper
d) Plastic
3. What is the unit of electrical resistance?
a) Ampere
b) Volt
c) Ohm
d) Watt
4. What does a battery do in a circuit?
a) Measures current
b) Provides voltage
c) Controls resistance
d) Stops the flow of charge
5. What is voltage often described as?
a) The flow of electric charge
b) The electrical pressure
c) The opposition to current
d) The rate of energy use
6. What is the function of a switch in a circuit?
a) To increase voltage
b) To decrease resistance
c) To open or close the circuit
d) To measure current
7. If you increase the voltage in a circuit, what happens to the current (assuming resistance stays the same)?
a) It increases
b) It decreases
c) It stays the same
d) It stops
8. Which of these materials is a good insulator?
a) Silver
b) Aluminum
c) Glass
d) Gold
9. What is electric power measured in?
a) Amperes
b) Volts
c) Ohms
d) Watts
10. What is the formula for Ohm's Law?
a) P = IV
b) V = IR
c) E = mc²
d) F = ma
11. According to Ohm's Law, if the resistance in a circuit increases, and the voltage stays the same, the current will:
a) Increase
b) Decrease
c) Stay the same
d) Stop completely
12. What is the purpose of a resistor in a circuit?
a) To provide voltage
b) To measure current
c) To limit current flow
d) To store energy
13. What type of circuit has only one path for the current to flow?
a) Parallel circuit
b) Series circuit
c) Short circuit
d) Open circuit
14. In a parallel circuit, what is the same for all components?
a) Current
b) Resistance
c) Voltage
d) Power
15. In a series circuit, what is the same for all components?
a) Current
b) Voltage
c) Resistance
d) Power
16. What happens to the total resistance when you add resistors in series?
a) It increases
b) It decreases
c) It stays the same
d) It becomes zero
17. What happens to the total resistance when you add resistors in parallel?
a) It increases
b) It decreases
c) It stays the same
d) It becomes infinite
18. What is the name for a continuous, unbroken path through which electricity can flow?
a) Insulator
b) Circuit
c) Resistor
d) Voltage
19. Which of these is a safety device designed to protect a circuit from too much current?
a) Resistor
b) Battery
c) Fuse
d) Switch
20. Which of these is used to store electrical energy?
a) Resistor
b) Capacitor
c) Inductor
d) Switch
Answer Key:
1. c
2. c
3. c
4. b
5. b
6. c
7. a
8. c
9. d
10. b
11. b
12. c
13. b
14. c
15. a
16. a
17. b
18. b
19. c
20. b