Q. In a parallel circuit, if one branch has a resistance of 4Ω and another has 8Ω, what is the equivalent resistance? (2020)
A.
2.67Ω
B.
3Ω
C.
4Ω
D.
6Ω
Show solution
Solution
1/R_eq = 1/4 + 1/8 = 2/8 + 1/8 = 3/8, so R_eq = 8/3Ω ≈ 2.67Ω.
Correct Answer:
A
— 2.67Ω
Learn More →
Q. What happens to the total current in a parallel circuit if one branch is removed? (2021)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the branch
Show solution
Solution
Removing a branch in a parallel circuit decreases the total current.
Correct Answer:
B
— Decreases
Learn More →
Q. What is the current through a 10Ω resistor connected to a 20V battery? (2020)
Show solution
Solution
Using Ohm's law, I = V/R = 20V / 10Ω = 2A.
Correct Answer:
B
— 2A
Learn More →
Q. What is the current through a 12Ω resistor connected to a 24V battery? (2023)
Show solution
Solution
Using Ohm's law, I = V/R = 24V / 12Ω = 2A.
Correct Answer:
B
— 2A
Learn More →
Q. What is the current through a 12Ω resistor connected to a 48V power supply? (2021)
Show solution
Solution
Using Ohm's law, I = V/R = 48V / 12Ω = 4A.
Correct Answer:
A
— 4A
Learn More →
Q. What is the current through a 12Ω resistor connected to a 48V source? (2021)
Show solution
Solution
Using Ohm's law, I = V/R = 48V / 12Ω = 4A.
Correct Answer:
A
— 4A
Learn More →
Q. What is the current through a 12Ω resistor when a voltage of 48V is applied across it? (2021)
Show solution
Solution
Using Ohm's law, I = V/R = 48V / 12Ω = 4A.
Correct Answer:
C
— 4A
Learn More →
Q. What is the current through a 12Ω resistor when a voltage of 48V is applied? (2023)
Show solution
Solution
Using Ohm's law, I = V/R = 48V / 12Ω = 4A.
Correct Answer:
B
— 6A
Learn More →
Q. What is the current through a 15Ω resistor connected to a 45V source? (2021)
Show solution
Solution
Using Ohm's law, I = V/R = 45V / 15Ω = 3A.
Correct Answer:
A
— 3A
Learn More →
Q. What is the effect on the total resistance in a series circuit if one resistor is removed? (2023)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
Removing a resistor from a series circuit decreases the total resistance since the sum of the remaining resistances is less.
Correct Answer:
B
— Decreases
Learn More →
Q. What is the equivalent resistance of two 4Ω resistors in parallel? (2019)
Show solution
Solution
Using the formula 1/R_eq = 1/R1 + 1/R2, we get 1/R_eq = 1/4 + 1/4 = 1/2, thus R_eq = 2Ω.
Correct Answer:
A
— 2Ω
Learn More →
Q. What is the equivalent resistance of two resistors of 4Ω and 12Ω in parallel? (2022)
Show solution
Solution
Using the formula 1/R_eq = 1/R1 + 1/R2, we get 1/R_eq = 1/4 + 1/12 = 1/3, so R_eq = 3Ω.
Correct Answer:
A
— 3Ω
Learn More →
Q. What is the potential difference across a 5Ω resistor carrying a current of 2A? (2023)
Show solution
Solution
Using Ohm's law, V = IR = 2A * 5Ω = 10V.
Correct Answer:
A
— 10V
Learn More →
Q. What is the power consumed by a 100Ω resistor when a current of 0.5A flows through it? (2020)
A.
25W
B.
50W
C.
100W
D.
12.5W
Show solution
Solution
Power (P) is given by P = I^2R = (0.5A)^2 * 100Ω = 0.25 * 100 = 25W.
Correct Answer:
A
— 25W
Learn More →
Q. What is the power consumed by a 6Ω resistor when a current of 2A flows through it? (2023)
A.
12W
B.
24W
C.
6W
D.
8W
Show solution
Solution
Power (P) is given by P = I²R = (2A)² * 6Ω = 4 * 6 = 24W.
Correct Answer:
A
— 12W
Learn More →
Q. What is the power consumed by a 6Ω resistor when a current of 3A flows through it? (2021)
A.
18W
B.
9W
C.
36W
D.
12W
Show solution
Solution
Power (P) is given by P = I^2 * R = (3A)^2 * 6Ω = 9 * 6 = 54W.
Correct Answer:
A
— 18W
Learn More →
Q. What is the resistance of a circuit if a current of 5A flows through it when a voltage of 25V is applied? (2022)
A.
5Ω
B.
10Ω
C.
15Ω
D.
20Ω
Show solution
Solution
Using Ohm's law (R = V/I), R = 25V / 5A = 5Ω.
Correct Answer:
B
— 10Ω
Learn More →
Q. What is the total current flowing through a circuit with a 9V battery and a total resistance of 3Ω? (2022)
Show solution
Solution
Using Ohm's law, I = V/R = 9V / 3Ω = 3A.
Correct Answer:
B
— 2A
Learn More →
Q. What is the total current in a circuit with a 15V battery and two 5Ω resistors in series? (2023)
Show solution
Solution
Total resistance R = 5Ω + 5Ω = 10Ω; I = V/R = 15V / 10Ω = 1.5A.
Correct Answer:
B
— 2A
Learn More →
Q. What is the total current in a circuit with two branches, one with 3A and the other with 2A? (2022)
Show solution
Solution
In parallel circuits, the total current is the sum of the currents in each branch: I_total = 3A + 2A = 5A.
Correct Answer:
A
— 5A
Learn More →
Q. What is the total current in a parallel circuit with two branches carrying 3A and 5A? (2020)
Show solution
Solution
In a parallel circuit, the total current (I_total) is the sum of the currents in each branch: I_total = 3A + 5A = 8A.
Correct Answer:
A
— 8A
Learn More →
Q. What is the total power consumed in a circuit with two 10Ω resistors in series connected to a 20V source? (2020)
A.
20W
B.
40W
C.
10W
D.
30W
Show solution
Solution
Total resistance R = 10Ω + 10Ω = 20Ω. Power P = V²/R = 20² / 20 = 20W.
Correct Answer:
B
— 40W
Learn More →
Q. What is the total power consumed in a circuit with two 5Ω resistors in series connected to a 30V battery? (2023)
A.
90W
B.
60W
C.
30W
D.
45W
Show solution
Solution
Total resistance R = 5Ω + 5Ω = 10Ω; Power P = V²/R = 30²/10 = 90W.
Correct Answer:
B
— 60W
Learn More →
Q. What is the total resistance in a circuit with a 10Ω resistor and a 20Ω resistor in series? (2022)
A.
30Ω
B.
20Ω
C.
10Ω
D.
15Ω
Show solution
Solution
In series, R_eq = R1 + R2 = 10Ω + 20Ω = 30Ω.
Correct Answer:
A
— 30Ω
Learn More →
Q. What is the total resistance in a circuit with a 10Ω resistor in series with a 20Ω resistor? (2022)
A.
10Ω
B.
20Ω
C.
30Ω
D.
15Ω
Show solution
Solution
In series, R_eq = R1 + R2 = 10Ω + 20Ω = 30Ω.
Correct Answer:
C
— 30Ω
Learn More →
Q. What is the total resistance in a circuit with a 4Ω and a 6Ω resistor in series? (2022)
A.
10Ω
B.
24Ω
C.
2.4Ω
D.
1.5Ω
Show solution
Solution
In series, R_total = R1 + R2 = 4Ω + 6Ω = 10Ω.
Correct Answer:
A
— 10Ω
Learn More →
Q. What is the total resistance of two 4Ω resistors connected in series? (2020)
Show solution
Solution
In series, R_eq = R1 + R2 = 4Ω + 4Ω = 8Ω.
Correct Answer:
B
— 8Ω
Learn More →
Q. What is the total resistance of two resistors of 4Ω and 6Ω connected in parallel? (2021)
A.
2.4Ω
B.
10Ω
C.
24Ω
D.
1.5Ω
Show solution
Solution
For parallel resistors, 1/R_eq = 1/R1 + 1/R2 = 1/4 + 1/6. Finding a common denominator gives R_eq = 2.4Ω.
Correct Answer:
A
— 2.4Ω
Learn More →
Q. What is the voltage across a 10Ω resistor carrying a current of 3A? (2022)
A.
30V
B.
20V
C.
10V
D.
15V
Show solution
Solution
Using Ohm's law, V = IR = 3A * 10Ω = 30V.
Correct Answer:
A
— 30V
Learn More →
Q. What is the voltage across a 12Ω resistor carrying a current of 1.5A? (2023)
A.
18V
B.
12V
C.
6V
D.
24V
Show solution
Solution
Using Ohm's law, V = IR = 1.5A * 12Ω = 18V.
Correct Answer:
A
— 18V
Learn More →
Showing 61 to 90 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!
