Ohm’s Law describes the fundamental relationship in electrical circuits, stating that the current (I) passing through a conductor is directly proportional to the voltage (V) applied across it and inversely proportional to the resistance (R) of the conductor. This is mathematically expressed as V = I × R, where V is measured in volts, I in amperes, and R in ohms. This law, formulated by Georg Ohm, is essential for analyzing and designing electrical systems, as it helps predict how changes in voltage or resistance affect current flow.
Table of contents
- Part 1: OnlineExamMaker AI quiz maker – Make a free quiz in minutes
- Part 2: 20 Ohm’s law quiz questions & answers
- Part 3: Save time and energy: generate quiz questions with AI technology
Part 1: OnlineExamMaker AI quiz maker – Make a free quiz in minutes
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Part 2: 20 Ohm’s law quiz questions & answers
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Question 1:
If a current of 2 amperes flows through a resistor with a resistance of 5 ohms, what is the voltage across the resistor?
A) 10 volts
B) 5 volts
C) 2 volts
D) 7 volts
Answer: A) 10 volts
Explanation: Ohm’s Law states V = I × R. So, V = 2 A × 5 Ω = 10 volts.
Question 2:
What is the current flowing through a circuit if the voltage is 12 volts and the resistance is 3 ohms?
A) 4 amperes
B) 9 amperes
C) 15 amperes
D) 36 amperes
Answer: A) 4 amperes
Explanation: From Ohm’s Law, I = V / R. So, I = 12 V / 3 Ω = 4 amperes.
Question 3:
A resistor has a voltage of 20 volts across it and a current of 4 amperes. What is its resistance?
A) 5 ohms
B) 10 ohms
C) 15 ohms
D) 20 ohms
Answer: A) 5 ohms
Explanation: Using Ohm’s Law, R = V / I. So, R = 20 V / 4 A = 5 ohms.
Question 4:
If the resistance in a circuit is 8 ohms and the current is 1.5 amperes, what is the voltage?
A) 6 volts
B) 12 volts
C) 9.5 volts
D) 10.5 volts
Answer: B) 12 volts
Explanation: Ohm’s Law: V = I × R. So, V = 1.5 A × 8 Ω = 12 volts.
Question 5:
What current flows through a 4-ohm resistor when 16 volts is applied?
A) 2 amperes
B) 4 amperes
C) 6 amperes
D) 8 amperes
Answer: B) 4 amperes
Explanation: I = V / R. So, I = 16 V / 4 Ω = 4 amperes.
Question 6:
A device has a resistance of 10 ohms and is connected to a 50-volt source. What is the current?
A) 5 amperes
B) 10 amperes
C) 15 amperes
D) 20 amperes
Answer: A) 5 amperes
Explanation: Ohm’s Law: I = V / R. So, I = 50 V / 10 Ω = 5 amperes.
Question 7:
If the voltage across a conductor is 9 volts and the resistance is 3 ohms, what is the current?
A) 3 amperes
B) 6 amperes
C) 9 amperes
D) 12 amperes
Answer: A) 3 amperes
Explanation: I = V / R. So, I = 9 V / 3 Ω = 3 amperes.
Question 8:
What is the resistance of a wire if a current of 0.5 amperes flows when 10 volts is applied?
A) 10 ohms
B) 20 ohms
C) 5 ohms
D) 15 ohms
Answer: B) 20 ohms
Explanation: R = V / I. So, R = 10 V / 0.5 A = 20 ohms.
Question 9:
In a circuit, 25 volts produces a current of 5 amperes. What is the resistance?
A) 5 ohms
B) 10 ohms
C) 15 ohms
D) 20 ohms
Answer: A) 5 ohms
Explanation: Ohm’s Law: R = V / I. So, R = 25 V / 5 A = 5 ohms.
Question 10:
If a bulb has a resistance of 100 ohms and the current is 0.2 amperes, what is the voltage?
A) 10 volts
B) 20 volts
C) 15 volts
D) 25 volts
Answer: B) 20 volts
Explanation: V = I × R. So, V = 0.2 A × 100 Ω = 20 volts.
Question 11:
What current will flow through a 6-ohm resistor with 18 volts applied?
A) 3 amperes
B) 6 amperes
C) 9 amperes
D) 12 amperes
Answer: A) 3 amperes
Explanation: I = V / R. So, I = 18 V / 6 Ω = 3 amperes.
Question 12:
A circuit has a voltage of 30 volts and resistance of 15 ohms. What is the current?
A) 2 amperes
B) 4 amperes
C) 6 amperes
D) 8 amperes
Answer: A) 2 amperes
Explanation: Ohm’s Law: I = V / R. So, I = 30 V / 15 Ω = 2 amperes.
Question 13:
If the current through a resistor is 10 amperes and voltage is 50 volts, what is the resistance?
A) 5 ohms
B) 10 ohms
C) 15 ohms
D) 20 ohms
Answer: A) 5 ohms
Explanation: R = V / I. So, R = 50 V / 10 A = 5 ohms.
Question 14:
What voltage is needed to produce 2 amperes of current in a 25-ohm resistor?
A) 25 volts
B) 50 volts
C) 30 volts
D) 40 volts
Answer: B) 50 volts
Explanation: V = I × R. So, V = 2 A × 25 Ω = 50 volts.
Question 15:
A resistor of 4 ohms carries a current of 3 amperes. What is the voltage across it?
A) 7 volts
B) 12 volts
C) 10 volts
D) 15 volts
Answer: B) 12 volts
Explanation: Ohm’s Law: V = I × R. So, V = 3 A × 4 Ω = 12 volts.
Question 16:
If 8 volts is applied across a 2-ohm resistor, what is the current?
A) 4 amperes
B) 6 amperes
C) 8 amperes
D) 10 amperes
Answer: A) 4 amperes
Explanation: I = V / R. So, I = 8 V / 2 Ω = 4 amperes.
Question 17:
What is the resistance if 40 volts produces 8 amperes of current?
A) 5 ohms
B) 10 ohms
C) 15 ohms
D) 20 ohms
Answer: A) 5 ohms
Explanation: R = V / I. So, R = 40 V / 8 A = 5 ohms.
Question 18:
For a current of 1 ampere and voltage of 10 volts, what is the resistance?
A) 10 ohms
B) 5 ohms
C) 15 ohms
D) 20 ohms
Answer: A) 10 ohms
Explanation: Ohm’s Law: R = V / I. So, R = 10 V / 1 A = 10 ohms.
Question 19:
If a device has 15 ohms resistance and 30 volts applied, what is the current?
A) 2 amperes
B) 4 amperes
C) 6 amperes
D) 8 amperes
Answer: A) 2 amperes
Explanation: I = V / R. So, I = 30 V / 15 Ω = 2 amperes.
Question 20:
What voltage is required for 5 amperes through a 10-ohm resistor?
A) 25 volts
B) 50 volts
C) 30 volts
D) 40 volts
Answer: B) 50 volts
Explanation: V = I × R. So, V = 5 A × 10 Ω = 50 volts.
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Part 3: Save time and energy: generate quiz questions with AI technology
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