Electric current is the flow of electric charge through a conductor, such as a wire, driven by a voltage difference. It is typically carried by the movement of electrons and is measured in amperes (A). This flow enables the operation of devices like lights, motors, and appliances, playing a fundamental role in everyday technology and power systems. The direction of current can be conventional (from positive to negative) or based on electron flow, and its magnitude depends on factors like resistance and voltage, as described by Ohm’s Law.
Table of contents
- Part 1: Create a electric current quiz in minutes using AI with OnlineExamMaker
- Part 2: 20 electric current quiz questions & answers
- Part 3: Save time and energy: generate quiz questions with AI technology
Part 1: Create a electric current quiz in minutes using AI with OnlineExamMaker
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Part 2: 20 electric current quiz questions & answers
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1. What is the unit of electric current?
A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: B
Explanation: Electric current is defined as the flow of electric charge, and its SI unit is the ampere (A), which measures the rate of charge flow.
2. According to Ohm’s law, what is the relationship between current (I), voltage (V), and resistance (R)?
A. I = V + R
B. I = V / R
C. I = V * R
D. I = R / V
Answer: B
Explanation: Ohm’s law states that current is directly proportional to voltage and inversely proportional to resistance, expressed as I = V / R.
3. In a series circuit, how does the total resistance compare to the individual resistances?
A. It is less than the smallest resistance
B. It is equal to the largest resistance
C. It is the sum of all individual resistances
D. It is the average of all resistances
Answer: C
Explanation: In a series circuit, resistances add up, so the total resistance is the sum of all individual resistances, increasing the overall opposition to current.
4. What happens to the current in a circuit if the voltage is increased while resistance remains constant?
A. Current decreases
B. Current remains the same
C. Current increases
D. Current becomes zero
Answer: C
Explanation: From Ohm’s law (I = V / R), if voltage increases and resistance is constant, the current must increase proportionally.
5. Which material is a good conductor of electric current?
A. Rubber
B. Glass
C. Copper
D. Wood
Answer: C
Explanation: Copper has free electrons that allow electric current to flow easily, making it an excellent conductor compared to insulators like rubber or glass.
6. In a parallel circuit, how is the voltage across each branch related?
A. It varies for each branch
B. It is the same for each branch
C. It is zero for all branches
D. It adds up across branches
Answer: B
Explanation: In a parallel circuit, the voltage is the same across each branch, allowing current to divide while maintaining equal potential difference.
7. What is the formula for electric power in a circuit?
A. P = I + V
B. P = I * R
C. P = V * I
D. P = R / V
Answer: C
Explanation: Electric power is calculated as the product of voltage and current, P = V * I, representing the rate of energy transfer.
8. If two resistors of 2 ohms and 4 ohms are connected in parallel, what is the total resistance?
A. 1.33 ohms
B. 2 ohms
C. 6 ohms
D. 8 ohms
Answer: A
Explanation: For parallel resistors, 1/R_total = 1/2 + 1/4 = 0.5 + 0.25 = 0.75, so R_total = 1 / 0.75 = 1.33 ohms.
9. What effect does increasing the resistance in a circuit have on the current, assuming voltage is constant?
A. Current increases
B. Current decreases
C. Current stays the same
D. Current becomes negative
Answer: B
Explanation: According to Ohm’s law, I = V / R; if resistance increases, current decreases because there is more opposition to the flow of charge.
10. Which of the following statements about direct current (DC) is true?
A. It changes direction periodically
B. It flows in one direction only
C. It is produced by transformers
D. It has no practical applications
Answer: B
Explanation: Direct current flows steadily in one direction, commonly used in batteries and electronic devices.
11. In a circuit with a 12-volt battery and a 3-ohm resistor, what is the current?
A. 4 amperes
B. 9 amperes
C. 15 amperes
D. 36 amperes
Answer: A
Explanation: Using Ohm’s law, I = V / R = 12 / 3 = 4 amperes.
12. What is the main function of a fuse in an electric circuit?
A. To increase current flow
B. To protect against overload by breaking the circuit
C. To store electrical energy
D. To amplify voltage
Answer: B
Explanation: A fuse melts and breaks the circuit if the current exceeds a safe level, preventing damage from overheating or fire.
13. How does the current divide in a parallel circuit with two branches of equal resistance?
A. All current goes through one branch
B. Current is equally divided between branches
C. Current is zero in both branches
D. Current adds up in branches
Answer: B
Explanation: In a parallel circuit with equal resistances, the current splits equally to maintain the same voltage across each branch.
14. What is the SI unit for electrical resistance?
A. Ampere
B. Volt
C. Ohm
D. Watt
Answer: C
Explanation: Resistance is measured in ohms (Ω), which quantifies how much a material opposes the flow of electric current.
15. If a circuit has a current of 2 amperes and a resistance of 5 ohms, what is the voltage?
A. 2.5 volts
B. 7 volts
C. 10 volts
D. 25 volts
Answer: C
Explanation: From Ohm’s law, V = I * R = 2 * 5 = 10 volts.
16. Which factor does not affect the resistance of a wire?
A. Length of the wire
B. Cross-sectional area
C. Material of the wire
D. Color of the wire
Answer: D
Explanation: Resistance depends on length, cross-sectional area, and material, but not on superficial properties like color.
17. In a series circuit, if one bulb burns out, what happens to the other bulbs?
A. They remain lit
B. They all go out
C. The circuit overloads
D. Only one other bulb goes out
Answer: B
Explanation: In a series circuit, the break in one component interrupts the entire circuit, so all bulbs connected in series will go out.
18. What is the difference between conventional current and electron flow?
A. They are the same
B. Conventional current flows from negative to positive, while electron flow is from positive to negative
C. Conventional current flows from positive to negative, while electron flow is from negative to positive
D. There is no such thing as electron flow
Answer: C
Explanation: Conventional current is defined as the flow of positive charge from positive to negative, whereas actual electron flow is from negative to positive.
19. How is current measured in a circuit?
A. Using a voltmeter
B. Using an ammeter
C. Using a resistor
D. Using a capacitor
Answer: B
Explanation: An ammeter is specifically designed to measure electric current by being connected in series with the circuit.
20. What happens to the total current in a parallel circuit if more branches are added?
A. It decreases
B. It remains the same
C. It increases
D. It becomes infinite
Answer: C
Explanation: Adding more branches in parallel provides more paths for current, so the total current from the source increases while the voltage stays the same.
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