Electric Circuits: Master Current, Voltage, Resistance, and Ohm's Law

Question 1

According to Ohm's law, how does voltage relate to current in a conductor?

Accepted Answer

Voltage is directly proportional to current.

Answer

Voltage is inversely proportional to current.

Answer

Voltage is equal to current.

Answer

Voltage is independent of current.

Question 2

A resistor with a resistance of 10 ohms is connected to a battery with an EMF of 12 volts. Calculate the current flowing through the resistor.

Accepted Answer

1.2 A

Answer

0.12 A

Answer

12 A

Answer

120 A

Question 3

Which of the following does NOT influence the resistance of a conductor?

Accepted Answer

Conductor color

Answer

Conductor length

Answer

Conductor cross-sectional area

Answer

Conductor temperature

Question 4

In a parallel circuit, the total current is:

Accepted Answer

Equal to the sum of the individual currents

Answer

Less than the sum of the individual currents

Answer

Greater than the sum of the individual currents

Answer

Zero

Question 5

In an electric circuit, the current flowing through a resistor is directly proportional to the voltage across the resistor. This relationship is known as:

Accepted Answer

Ohm's law

Answer

Kirchhoff's voltage law

Answer

Kirchhoff's current law

Answer

Joule's law

Question 6

In a parallel circuit, the total current flowing through the circuit is:

Accepted Answer

Equal to the sum of the currents through each branch

Answer

Less than the current through any individual branch

Answer

Greater than the current through any individual branch

Answer

Zero

Question 7

The capacitance of a capacitor is measured in:

Accepted Answer

Farads

Answer

Henrys

Answer

Coulombs

Answer

Ohms

Question 8

Which of the following is the SI unit of electric current?

Accepted Answer

Ampere (A)

Answer

Volt (V)

Answer

Ohm (Ω)

Answer

Coulomb (C)

Question 9

Ohm's law states that the current flowing through a conductor is directly proportional to:

Accepted Answer

Voltage

Answer

Resistance

Answer

Power

Answer

Temperature

Question 10

A resistor has a resistance of 10 ohms. If a voltage of 5 volts is applied across the resistor, what is the current flowing through it?

Accepted Answer

0.5 A

Answer

1 A

Answer

5 A

Answer

10 A

Question 11

A circuit consists of a battery, a resistor, and a voltmeter. The voltmeter is connected in parallel with the resistor. What will the voltmeter reading indicate?

Accepted Answer

Voltage across the resistor

Answer

Voltage across the battery

Answer

Current flowing through the circuit

Answer

Resistance of the resistor

Question 12

Which of the following is a type of resistor that can change its resistance?

Accepted Answer

Variable resistor

Answer

Fixed resistor

Answer

Power resistor

Answer

Wirewound resistor

Question 13

The capacitance of a capacitor is measured in:

Accepted Answer

Farads (F)

Answer

Henrys (H)

Answer

Volts (V)

Answer

Ohms (Ω)

Question 14

In the International System of Units (SI), which unit is used to measure electric current?

Accepted Answer

Ampere (A)

Answer

Watt (W)

Answer

Volt (V)

Answer

Ohm (Ω)

Question 15

In a parallel circuit, what is the relationship between the total current and the individual branch currents?

Accepted Answer

The total current is equal to the sum of the branch currents.

Answer

The total current is less than the sum of the branch currents.

Answer

The total current is greater than the sum of the branch currents.

Question 16

Which of the following is an example of an ohmic conductor?

Accepted Answer

Copper wire

Answer

Light-emitting diode (LED)

Answer

Thermistor

Answer

Solar cell

Question 17

What is the primary purpose of a fuse in an electric circuit?

Accepted Answer

To protect the circuit from excessive current.

Answer

To amplify the current in the circuit.

Answer

To store electrical energy.

Answer

To regulate the voltage in the circuit.

Question 18

In an electric circuit, which equation represents the relationship between voltage (V), current (I), and resistance (R)?

Accepted Answer

V = IR

Answer

R = VI

Answer

I = VR

Question 19

Which unit is used to measure electrical power in the SI system?

Accepted Answer

Watt (W)

Answer

Ampere (A)

Answer

Volt (V)

Answer

Ohm (Ω)

Question 20

What is the fundamental difference between an open circuit and a closed circuit?

Accepted Answer

In an open circuit, there is no current flow, while in a closed circuit, current can flow.

Answer

In an open circuit, the voltage is zero, while in a closed circuit, the voltage is non-zero.

Answer

In an open circuit, the resistance is infinite, while in a closed circuit, the resistance is zero.