Electrical Current & Ohm's Law Review
1. What is electrical current?
A) The voltage across a circuit
B) The flow of electric charge through a conductor
C) The resistance to electron flow
D) The energy stored in a capacitor
✓ Answer: B
2. The SI unit for electrical current is the:
A) Volt
B) Ohm
C) Ampere
D) Watt
✓ Answer: C
3. One ampere is equal to:
A) One volt per ohm
B) One coulomb per second
C) One watt per volt
D) Both A and B
✓ Answer: D
4. What symbol is used for current in equations?
A) V
B) R
C) I
, D) P
✓ Answer: C
5. Conventional current flows from:
A) Negative to positive terminal
B) Positive to negative terminal
C) Ground to source
D) Neutral to hot
✓ Answer: B
6. Electron flow (actual current) moves from:
A) Positive to negative terminal
B) Negative to positive terminal
C) Ground to neutral
D) Hot to neutral
✓ Answer: B
7. Which of the following is NOT a type of electrical current?
A) Direct Current (DC)
B) Alternating Current (AC)
C) Pulsating Current
D) Reflective Current
✓ Answer: D
8. In a DC circuit, current flows:
A) In both directions alternately
B) In one direction only
C) In a sinusoidal wave
D) At 60 Hz
✓ Answer: B
9. In an AC circuit, current:
A) Flows in one direction
B) Has no frequency
C) Reverses direction periodically
D) Cannot be measured in amperes
✓ Answer: C
10. The standard AC frequency in the United States is:
A) 50 Hz
, B) 60 Hz
C) 120 Hz
D) 400 Hz
✓ Answer: B
11. What is 1 milliampere (mA) equal to?
A) 0.001 A
B) 0.01 A
C) 1000 A
D) 100 A
✓ Answer: A
12. What does a higher ampere rating indicate?
A) Higher resistance
B) Lower voltage
C) More electrons passing a point per second
D) Less power consumption
✓ Answer: C
13. Current is measured using a(n):
A) Voltmeter
B) Ohmmeter
C) Ammeter
D) Wattmeter
✓ Answer: C
14. An ammeter is connected in a circuit:
A) In parallel
B) In series
C) Between ground and neutral
D) Across the load
✓ Answer: B
15. If current increases while resistance stays constant, voltage will:
A) Decrease
B) Stay the same
C) Increase
D) Drop to zero
✓ Answer: C
, 16. Which material allows electrical current to flow most easily?
A) Rubber
B) Glass
C) Copper
D) Plastic
✓ Answer: C
17. What happens to current if resistance doubles and voltage stays the same?
A) Current doubles
B) Current halves
C) Current stays the same
D) Current quadruples
✓ Answer: B
18. What is the charge of one coulomb equal to?
A) 6.24 × 10^18 electrons
B) 1.6 × 10^-19 electrons
C) 1 electron
D) 1,000 electrons
✓ Answer: A
19. Current flowing through a resistor produces:
A) Light only
B) Heat
C) Magnetic repulsion
D) Static charge
✓ Answer: B
20. A clamp meter measures current by detecting:
A) Voltage drop across a shunt
B) The magnetic field around a conductor
C) Temperature rise in the wire
D) Resistance of the insulation
✓ Answer: B
21. The symbol for microampere is:
A) mA
B) kA
C) µA
1. What is electrical current?
A) The voltage across a circuit
B) The flow of electric charge through a conductor
C) The resistance to electron flow
D) The energy stored in a capacitor
✓ Answer: B
2. The SI unit for electrical current is the:
A) Volt
B) Ohm
C) Ampere
D) Watt
✓ Answer: C
3. One ampere is equal to:
A) One volt per ohm
B) One coulomb per second
C) One watt per volt
D) Both A and B
✓ Answer: D
4. What symbol is used for current in equations?
A) V
B) R
C) I
, D) P
✓ Answer: C
5. Conventional current flows from:
A) Negative to positive terminal
B) Positive to negative terminal
C) Ground to source
D) Neutral to hot
✓ Answer: B
6. Electron flow (actual current) moves from:
A) Positive to negative terminal
B) Negative to positive terminal
C) Ground to neutral
D) Hot to neutral
✓ Answer: B
7. Which of the following is NOT a type of electrical current?
A) Direct Current (DC)
B) Alternating Current (AC)
C) Pulsating Current
D) Reflective Current
✓ Answer: D
8. In a DC circuit, current flows:
A) In both directions alternately
B) In one direction only
C) In a sinusoidal wave
D) At 60 Hz
✓ Answer: B
9. In an AC circuit, current:
A) Flows in one direction
B) Has no frequency
C) Reverses direction periodically
D) Cannot be measured in amperes
✓ Answer: C
10. The standard AC frequency in the United States is:
A) 50 Hz
, B) 60 Hz
C) 120 Hz
D) 400 Hz
✓ Answer: B
11. What is 1 milliampere (mA) equal to?
A) 0.001 A
B) 0.01 A
C) 1000 A
D) 100 A
✓ Answer: A
12. What does a higher ampere rating indicate?
A) Higher resistance
B) Lower voltage
C) More electrons passing a point per second
D) Less power consumption
✓ Answer: C
13. Current is measured using a(n):
A) Voltmeter
B) Ohmmeter
C) Ammeter
D) Wattmeter
✓ Answer: C
14. An ammeter is connected in a circuit:
A) In parallel
B) In series
C) Between ground and neutral
D) Across the load
✓ Answer: B
15. If current increases while resistance stays constant, voltage will:
A) Decrease
B) Stay the same
C) Increase
D) Drop to zero
✓ Answer: C
, 16. Which material allows electrical current to flow most easily?
A) Rubber
B) Glass
C) Copper
D) Plastic
✓ Answer: C
17. What happens to current if resistance doubles and voltage stays the same?
A) Current doubles
B) Current halves
C) Current stays the same
D) Current quadruples
✓ Answer: B
18. What is the charge of one coulomb equal to?
A) 6.24 × 10^18 electrons
B) 1.6 × 10^-19 electrons
C) 1 electron
D) 1,000 electrons
✓ Answer: A
19. Current flowing through a resistor produces:
A) Light only
B) Heat
C) Magnetic repulsion
D) Static charge
✓ Answer: B
20. A clamp meter measures current by detecting:
A) Voltage drop across a shunt
B) The magnetic field around a conductor
C) Temperature rise in the wire
D) Resistance of the insulation
✓ Answer: B
21. The symbol for microampere is:
A) mA
B) kA
C) µA
