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WorksheetsECT UNIT 1 - MCQ
Total questions: 50
Worksheet time: 2hrs 40mins
In a series circuit with three resistors (5Ω, 10Ω, 15Ω), what is the total resistance?
10Ω
15Ω
30Ω
5Ω
What does Ohm's Law state?
Current is inversely proportional to voltage.
Voltage is equal to resistance times current.
Power is equal to voltage divided by current.
Resistance is equal to current times power.
A 24V battery is connected across a 6Ω resistor. What is the current flowing through the resistor?
2A
4A
6A
8A
Kirchhoff's Voltage Law (KVL) is based on the law of:
Energy conservation
Charge conservation
Induction
Resistance
In a parallel circuit with resistors of 6Ω and 3Ω, what is the equivalent resistance?
2Ω
9Ω
4Ω
1.5Ω
What happens to the current in other branches when one branch of a parallel circuit is disconnected?
It increases
It decreases
It remains the same
It becomes zero
Convert a star network with three equal resistors of 3Ω into a delta network. What is each delta resistance?
3Ω
6Ω
9Ω
4.5Ω
Which method is best suited for analyzing circuits with multiple loops?
Node analysis
Mesh analysis
Ohm's law
Star-delta transformation
If a voltage source is in series with a resistor, it can be converted to:
A voltage divider
A current source in parallel with the resistor
An open circuit
A capacitor
In node analysis, what is the main variable calculated?
Resistance
Voltage at each node
Current in each mesh
Power loss
In a circuit, three resistors of 10Ω each are connected in parallel. What is the total resistance?
30Ω
10Ω
3.33Ω
0.3Ω
Kirchhoff's Current Law (KCL) is based on the principle of:
Energy conservation
Power dissipation
Charge conservation
Magnetic flux
If 5A enters a node and two branches leave carrying 2A and 1A, what is the current in the third outgoing branch?
1A
2A
3A
4A
Which of the following best describes a resistor?
A device that stores energy
A device that resists current flow
A source of electrical energy
A device that amplifies current
A 10V source is connected across a series combination of 2Ω and 3Ω resistors. What is the voltage across the 3Ω resistor?
2V
3V
6V
10V
In mesh analysis, which quantity is primarily calculated?
Node voltages
Branch power
Loop currents
Total resistance
Convert a delta network of 12Ω, 12Ω, and 12Ω resistors into star. What is each star resistance?
4Ω
6Ω
3Ω
12Ω
What happens to the total current in a parallel circuit when more branches are added?
It decreases
It increases
It remains constant
It becomes zero
Which transformation allows you to simplify a three-terminal resistive network?
Series to parallel
Delta to star
Voltage to current
Mesh to node
The purpose of source transformation is to:
Reduce power loss
Increase resistance
Simplify circuit analysis
Change the frequency
What is the power consumed by a 10Ω resistor with 2A current flowing through it?
5W
10W
20W
40W
Which statement is true about resistors in a series circuit?
The voltage across each resistor is the same
The current through each resistor is different
The current is the same through all resistors
The total resistance is less than the smallest resistor
Two resistors, 6Ω and 3Ω, are in series. A 9V battery is connected across them. What is the voltage across the 6Ω resistor?
3V
4.5V
6V
1.5V
In a resistive DC circuit, what is the phase difference between voltage and current?
90°
180°
45°
0°
A 12V voltage source and 4Ω resistor are converted into a current source. What is the current and parallel resistance?
4A, 4Ω
3A, 4Ω
2A, 4Ω
1A, 4Ω
Why is delta-star transformation used?
To improve voltage regulation
To simplify circuit solving
To increase power factor
To convert AC to DC
In a given circuit, two meshes share a common resistor of 5Ω. If the mesh currents are I₁ = 3A and I₂ = 1A (opposite direction), what is the voltage drop across the resistor?
10V
15V
5V
20V
Which of the following is NOT true about Node Voltage Method?
Based on KVL
Uses node voltages as variables
Suitable for circuits with many nodes
Requires identification of a reference node
A circuit has two resistors of 8Ω and 4Ω in parallel. What is the equivalent resistance?
6Ω
2.67Ω
3Ω
4Ω
When two resistors are connected in parallel, the total resistance is always:
More than the largest resistor
Equal to the sum of the resistors
Less than the smallest resistor
Equal to the largest resistor
Which component is not used for resistive circuit analysis?
Resistor
Inductor
Voltage source
Current source
If a 20V supply causes a current of 2A in a resistor, what is the value of the resistor?
5Ω
10Ω
20Ω
40Ω
Which law is essential for solving current at a junction in a circuit?
Kirchhoff's Voltage Law
Ohm's Law
Kirchhoff's Current Law
Norton's Law
A resistor of 4Ω is connected in series with a resistor of 6Ω. What fraction of total voltage appears across the 6Ω resistor?
2/5
3/5
4/5
6/10
The direction of current flow is assumed to be:
From negative to positive
From positive to negative
From ground to source
Always clockwise
Two identical resistors in series have a total resistance of 16Ω. What is the resistance of each?
4Ω
8Ω
16Ω
32Ω
What is a supernode in circuit analysis?
A loop with no voltage source
Two or more nodes combined due to a voltage source between them
A node with no current
A node with highest voltage
In a mesh, if 12V is dropped across a 3Ω resistor, what is the current?
2A
3A
4A
6A
Which is true for resistors in parallel?
Same current flows through all
Total resistance is greater than any individual resistance
Voltage across each resistor is the same
Power consumed is always the same in each
A 12V battery is connected across two parallel resistors: 6Ω and 12Ω. What is the current through the 6Ω resistor?
1A
2A
3A
4A
A 9V battery is connected to a resistor of 3 Ohm. What is the current?
3A
6A
9A
12A
You have three resistors: 2 Ohm, 3 Ohm, and 5 Ohm. Which two can be connected in series to get 5 Ohm?
2Ω and 3Ω
5Ω and 3Ω
2Ω and 5Ω
3Ω and 5Ω
Two circuits are connected to the same battery. Circuit A has 6Ω resistance, and Circuit B has 3Ω. Which circuit uses more current?
Circuit A
Circuit B
Both same
Cannot say
In a parallel circuit, one branch has a 10Ω resistor. If 2A flows through it, what is the voltage?
5V
10V
20V
0.2V
If a bulb does not glow in a simple circuit, what could be the reason?
Too much resistance
Loose wire
Battery is dead
All of the above
You want to reduce the total resistance of a circuit. What should you do?
Add more resistors in series
Add more resistors in parallel
Remove all resistors
Increase battery voltage
Which is more effective for saving energy in a home circuit?
Series connection
Parallel connection
Short circuit
Use low-resistance wires only
You have a 12V battery and want to design a circuit with 2A current. What resistance should you use?
2Ω
4Ω
6Ω
12Ω
In a mesh, one loop has only a 5V battery and 5Ω resistor. Current in that loop?
1A
2A
5A
10A
Which of the following is not needed in node voltage method?
Voltage source
Ground node
Mesh current
Node voltage
