Ohm's Law: Master the Relationship Between Voltage, Current, and Resistance

Question 1

Which material has high electrical conductivity?

Accepted Answer

Copper

Answer

Plastic

Answer

Wood

Answer

Rubber

Question 2

In a circuit with a voltage source, resistor, and ammeter, the ammeter should be connected:

Accepted Answer

In series with the resistor

Answer

In series with the voltage source

Answer

In parallel with the resistor

Answer

In parallel with the voltage source

Question 3

The unit of electrical resistance is:

Accepted Answer

Ohm

Answer

Ampere

Answer

Volt

Answer

Coulomb

Question 4

In a series circuit, the total resistance is:

Accepted Answer

Equal to the sum of the individual resistances

Answer

Less than the sum of the individual resistances

Answer

Greater than the sum of the individual resistances

Answer

Dependent on the voltage of the circuit

Question 5

The primary function of a circuit breaker is to:

Accepted Answer

Protect a circuit from excessive current

Answer

Maintain a constant voltage in a circuit

Answer

Store electrical energy

Answer

Regulate the flow of electrons in a circuit

Question 6

According to Ohm's Law, which formula calculates the power dissipated in an electrical circuit?

Accepted Answer

P = I^2 * R

Answer

P = V / I

Answer

P = V * R

Question 7

According to the International System of Units (SI), the unit that measures electrical resistance is:

Accepted Answer

Ohm

Answer

Ampere

Answer

Volt

Answer

Watt

Question 8

Ohm's Law establishes that the current flowing through a conductor is directly proportional to the:

Accepted Answer

Voltage

Answer

Resistance

Answer

Power

Answer

Frequency

Question 9

Among the following materials, the one with the highest electrical resistance is:

Accepted Answer

Rubber

Answer

Copper

Answer

Silver

Answer

Graphite

Question 10

When a 10-ohm resistor is connected in parallel with a 15-ohm resistor, the equivalent resistance of the combination is:

Accepted Answer

5 ohms

Answer

10 ohms

Answer

15 ohms

Answer

25 ohms

Question 11

A voltmeter is used to measure:

Accepted Answer

Voltage

Answer

Current

Answer

Resistance

Answer

Power

Question 12

The unit used to measure electrical power is:

Accepted Answer

Watt

Answer

Ampere

Answer

Ohm

Answer

Volt

Question 13

In a circuit with a power consumption of 100 watts and a voltage of 20 volts, the current flowing is:

Accepted Answer

5 Amperes

Answer

10 Amperes

Answer

15 Amperes

Answer

20 Amperes

Question 14

What mathematical expression represents Ohm's Law?

Accepted Answer

V = IR

Answer

I = VR

Answer

R = VI

Answer

R = V/I

Question 15

If the voltage across a resistor remains constant while the resistance decreases, the current:

Accepted Answer

Increases

Answer

Decreases

Answer

Stays the same

Answer

Fluctuates

Question 16

What is the unit of resistance in the International System of Units (SI)?

Accepted Answer

Ohm

Answer

Ampere

Answer

Volt

Answer

Coulomb

Question 17

In a circuit with a battery having an EMF of 12 volts and a total resistance of 4 ohms, what is the current flowing through the circuit?

Accepted Answer

2 amps

Answer

6 amps

Answer

8 amps

Answer

12 amps

Question 18

What primary function does a resistor serve in an electrical circuit?

Accepted Answer

Regulates current flow

Answer

Stores energy

Answer

Amplifies signals

Answer

Filters noise

Question 19

To determine the resistance of a circuit component using Ohm's Law, which two quantities need to be measured?

Accepted Answer

Voltage and current

Answer

Current and power

Answer

Voltage and power

Answer

Resistance and power

Question 20

Ohm's Law expresses the relationship between which three electrical quantities?

Accepted Answer

Voltage, current, and resistance

Answer

Impedance, reactance, and admittance

Answer

Frequency, inductance, and capacitance

Answer

Power, energy, and efficiency

Question 21

In a circuit with a 12-volt battery and a 6-ohm resistor, what is the current flowing through the resistor?

Accepted Answer

2 amperes

Answer

0.5 amperes

Answer

6 amperes

Answer

12 amperes

Question 22

What is the SI unit of resistance?

Accepted Answer

Ohm (Ω)

Answer

Volt (V)

Answer

Ampere (A)

Answer

Siemens (S)

Question 23

Which of the following is a practical application of Ohm's Law in electronics?

Accepted Answer

Designing resistors for specific resistance values

Answer

Measuring the speed of light

Answer

Predicting the weather

Answer

Determining the height of a building

Question 24

Which of the following materials has the highest electrical resistance?

Accepted Answer

Rubber

Answer

Aluminum

Answer

Copper

Answer

Silver