Q. A 100W bulb operates at 220V. What is the resistance of the bulb? (2021)
A.
484Ω
B.
220Ω
C.
110Ω
D.
100Ω
Show solution
Solution
Using P = V^2/R, we rearrange to find R = V^2/P = (220V)^2 / 100W = 484Ω.
Correct Answer:
A
— 484Ω
Learn More →
Q. A 12V battery is connected across a 4Ω resistor. What is the current flowing through the resistor? (2020)
Show solution
Solution
Using Ohm's law, I = V/R = 12V / 4Ω = 3A.
Correct Answer:
A
— 2A
Learn More →
Q. A 12V battery is connected to a resistor of 4Ω. What is the current flowing through the circuit? (2022)
Show solution
Solution
Using Ohm's law, I = V/R = 12V / 4Ω = 3A.
Correct Answer:
A
— 2A
Learn More →
Q. A 9V battery is connected to a circuit with a total resistance of 3Ω. What is the total current flowing in the circuit? (2023)
Show solution
Solution
Using Ohm's law, I = V/R = 9V / 3Ω = 3A.
Correct Answer:
B
— 2A
Learn More →
Q. A circuit consists of a 9V battery and two resistors of 3Ω and 6Ω in series. What is the current flowing through the circuit? (2021)
Show solution
Solution
Total resistance R = 3Ω + 6Ω = 9Ω. Current I = V/R = 9V / 9Ω = 1A.
Correct Answer:
B
— 2A
Learn More →
Q. A circuit has a 15V battery and a 5Ω resistor. What is the voltage drop across the resistor? (2021)
A.
3V
B.
5V
C.
15V
D.
10V
Show solution
Solution
The voltage drop across the resistor is equal to the battery voltage, which is 15V.
Correct Answer:
C
— 15V
Learn More →
Q. A circuit has a 24V battery and a total resistance of 12Ω. What is the current flowing through the circuit? (2020)
Show solution
Solution
Using Ohm's law, I = V/R = 24V / 12Ω = 2A.
Correct Answer:
B
— 4A
Learn More →
Q. A circuit has a 24V battery and a total resistance of 6Ω. What is the current flowing through the circuit? (2020)
Show solution
Solution
Using Ohm's law, I = V/R = 24V / 6Ω = 4A.
Correct Answer:
A
— 4A
Learn More →
Q. A circuit has a 5Ω resistor and a 10Ω resistor in parallel. What is the total current if the voltage across them is 20V? (2021)
Show solution
Solution
First, find the equivalent resistance: 1/R_eq = 1/5 + 1/10 = 3/10, so R_eq = 10/3Ω. Then, I = V/R_eq = 20V / (10/3)Ω = 6A.
Correct Answer:
D
— 8A
Learn More →
Q. A circuit has a 9V battery and two resistors of 3Ω and 6Ω in series. What is the current flowing through the circuit? (2022)
Show solution
Solution
Total resistance R = 3Ω + 6Ω = 9Ω. Current I = V/R = 9V / 9Ω = 1A.
Correct Answer:
B
— 2A
Learn More →
Q. A circuit has a total resistance of 12Ω and a current of 1.5A. What is the voltage across the circuit? (2021)
A.
18V
B.
12V
C.
15V
D.
9V
Show solution
Solution
Using Ohm's law, V = IR = 1.5A * 12Ω = 18V.
Correct Answer:
A
— 18V
Learn More →
Q. A circuit has a total resistance of 12Ω and a current of 2A. What is the voltage across the circuit? (2021)
A.
24V
B.
12V
C.
6V
D.
48V
Show solution
Solution
Using Ohm's law (V = IR), V = 2A * 12Ω = 24V.
Correct Answer:
A
— 24V
Learn More →
Q. A circuit has a total resistance of 20Ω and a current of 2A flowing through it. What is the voltage across the circuit? (2023)
A.
30V
B.
40V
C.
20V
D.
10V
Show solution
Solution
Using Ohm's law, V = I * R = 2A * 20Ω = 40V.
Correct Answer:
B
— 40V
Learn More →
Q. A circuit has a total resistance of 5Ω and a current of 2A. What is the voltage across the circuit? (2023)
Show solution
Solution
Using Ohm's law, V = I * R = 2A * 5Ω = 10V.
Correct Answer:
A
— 10V
Learn More →
Q. A circuit has a total resistance of 8Ω and a current of 4A flowing through it. What is the voltage across the circuit? (2021)
A.
32V
B.
16V
C.
8V
D.
4V
Show solution
Solution
Using Ohm's law, V = I * R = 4A * 8Ω = 32V.
Correct Answer:
A
— 32V
Learn More →
Q. A circuit has a total resistance of 8Ω and a current of 4A. What is the voltage across the circuit? (2021)
A.
32V
B.
16V
C.
8V
D.
4V
Show solution
Solution
Using Ohm's law, V = I * R = 4A * 8Ω = 32V.
Correct Answer:
A
— 32V
Learn More →
Q. A circuit has a total voltage of 24V and a total current of 4A. What is the total resistance in the circuit? (2021)
Show solution
Solution
Using Ohm's law, R = V/I = 24V / 4A = 6Ω.
Correct Answer:
B
— 8Ω
Learn More →
Q. A circuit has a total voltage of 24V and a total resistance of 8Ω. What is the total current in the circuit? (2020)
Show solution
Solution
Using Ohm's law, I = V/R = 24V / 8Ω = 3A.
Correct Answer:
A
— 3A
Learn More →
Q. A resistor of 10Ω is connected across a 20V battery. What is the power consumed by the resistor? (2021)
A.
40W
B.
20W
C.
10W
D.
5W
Show solution
Solution
Power (P) is given by P = V^2/R = 20V^2 / 10Ω = 400W / 10 = 40W.
Correct Answer:
A
— 40W
Learn More →
Q. A resistor of 10Ω is connected to a 20V battery. What is the power consumed by the resistor? (2021)
A.
40W
B.
20W
C.
10W
D.
2W
Show solution
Solution
Power (P) is given by P = V^2/R = (20V)^2 / 10Ω = 400/10 = 40W.
Correct Answer:
A
— 40W
Learn More →
Q. A resistor of 10Ω is connected to a 20V power supply. What is the power consumed by the resistor? (2021)
A.
40W
B.
20W
C.
10W
D.
2W
Show solution
Solution
Power (P) is given by P = V^2/R = (20V)^2 / 10Ω = 400/10 = 40W.
Correct Answer:
A
— 40W
Learn More →
Q. If a 100Ω resistor is connected in series with a 200Ω resistor, what is the total resistance? (2023)
A.
300Ω
B.
100Ω
C.
200Ω
D.
400Ω
Show solution
Solution
In series, R_total = R1 + R2 = 100Ω + 200Ω = 300Ω.
Correct Answer:
A
— 300Ω
Learn More →
Q. If a 10Ω resistor is connected in parallel with a 5Ω resistor, what is the equivalent resistance? (2022)
A.
3.33Ω
B.
5Ω
C.
7.5Ω
D.
15Ω
Show solution
Solution
For parallel resistors, 1/R_eq = 1/R1 + 1/R2 = 1/10 + 1/5 = 1/10 + 2/10 = 3/10. Therefore, R_eq = 10/3 = 3.33Ω.
Correct Answer:
A
— 3.33Ω
Learn More →
Q. If a 10Ω resistor is connected in parallel with a 5Ω resistor, what is the total resistance? (2022)
A.
3.33Ω
B.
5Ω
C.
7.5Ω
D.
15Ω
Show solution
Solution
For resistors in parallel, 1/R_eq = 1/R1 + 1/R2 = 1/10 + 1/5 = 1/10 + 2/10 = 3/10. Therefore, R_eq = 10/3 = 3.33Ω.
Correct Answer:
A
— 3.33Ω
Learn More →
Q. If a 15Ω resistor is connected in parallel with a 30Ω resistor, what is the equivalent resistance? (2021)
A.
10Ω
B.
7.5Ω
C.
5Ω
D.
12Ω
Show solution
Solution
For resistors in parallel, 1/R_eq = 1/R1 + 1/R2 = 1/15 + 1/30 = 2/30 + 1/30 = 3/30. Therefore, R_eq = 30/3 = 10Ω.
Correct Answer:
B
— 7.5Ω
Learn More →
Q. If a 15Ω resistor is connected in parallel with a 5Ω resistor, what is the equivalent resistance? (2023)
A.
3.75Ω
B.
4Ω
C.
5Ω
D.
10Ω
Show solution
Solution
1/R_eq = 1/15 + 1/5 = 1/15 + 3/15 = 4/15; R_eq = 15/4 = 3.75Ω.
Correct Answer:
A
— 3.75Ω
Learn More →
Q. If a 5Ω resistor is connected in series with a 10Ω resistor, what is the total resistance? (2022)
A.
15Ω
B.
5Ω
C.
10Ω
D.
20Ω
Show solution
Solution
In series, R_eq = R1 + R2 = 5Ω + 10Ω = 15Ω.
Correct Answer:
A
— 15Ω
Learn More →
Q. If a 5Ω resistor is connected to a 10V source, what is the power dissipated? (2023)
A.
2W
B.
5W
C.
10W
D.
20W
Show solution
Solution
Power P = V²/R = (10V)² / 5Ω = 100 / 5 = 20W.
Correct Answer:
C
— 10W
Learn More →
Q. If a 6Ω and a 3Ω resistor are connected in parallel, what is the equivalent resistance? (2022)
A.
2Ω
B.
4Ω
C.
1.5Ω
D.
9Ω
Show solution
Solution
Using the formula for parallel resistors: 1/R_eq = 1/R1 + 1/R2 = 1/6 + 1/3 = 1/6 + 2/6 = 3/6. Therefore, R_eq = 2Ω.
Correct Answer:
A
— 2Ω
Learn More →
Q. If a 6Ω resistor is connected in parallel with a 3Ω resistor, what is the equivalent resistance? (2023)
A.
2Ω
B.
1.5Ω
C.
4Ω
D.
9Ω
Show solution
Solution
Using the formula 1/R_eq = 1/R1 + 1/R2, we get 1/R_eq = 1/6 + 1/3 = 1/6 + 2/6 = 3/6, thus R_eq = 2Ω.
Correct Answer:
A
— 2Ω
Learn More →
Showing 1 to 30 of 93 (4 Pages)
Current Electricity MCQ & Objective Questions
Current Electricity is a vital topic in physics that plays a significant role in various school and competitive exams. Understanding this concept not only helps in grasping fundamental principles but also enhances your ability to tackle MCQs and objective questions effectively. Practicing Current Electricity MCQ questions can significantly improve your exam preparation and boost your confidence in answering important questions.
What You Will Practise Here
Ohm's Law and its applications
Series and parallel circuits
Electrical power and energy calculations
Resistance, capacitance, and inductance concepts
Kirchhoff's laws and circuit analysis
Understanding current, voltage, and resistance relationships
Practical applications of Current Electricity in daily life
Exam Relevance
Current Electricity is a crucial topic in various examinations, including CBSE, State Boards, NEET, and JEE. Students can expect questions that assess their understanding of key concepts, calculations, and application-based scenarios. Common question patterns include numerical problems, theoretical questions, and circuit diagram analysis, making it essential to master this topic for scoring well in exams.
Common Mistakes Students Make
Confusing series and parallel circuit calculations
Misapplying Ohm's Law in complex circuits
Overlooking units in calculations, leading to incorrect answers
Failing to understand the significance of Kirchhoff's laws
Neglecting practical applications, which can lead to conceptual gaps
FAQs
Question: What is Ohm's Law?Answer: Ohm's Law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points, provided the temperature remains constant.
Question: How do you calculate total resistance in a series circuit?Answer: In a series circuit, the total resistance is the sum of all individual resistances: R_total = R1 + R2 + R3 + ...
Ready to enhance your understanding of Current Electricity? Dive into our practice MCQs and test your knowledge to excel in your exams!
