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

Question 1

According to Ohm's Law, the current (I) flowing through a conductor is directly proportional to the:

Accepted Answer

Voltage (V)

Answer

Resistance (R)

Answer

Power (P)

Answer

Frequency (f)

Question 2

A resistor with a resistance of 10 ohms has a current of 2 amps flowing through it. Calculate the voltage across the resistor.

Accepted Answer

10 volts

Answer

5 volts

Answer

20 volts

Answer

40 volts

Question 3

A circuit dissipates 100 watts of power. If the voltage across the circuit is 10 volts, calculate the current flowing through it.

Accepted Answer

10 amps

Answer

1 amp

Answer

100 amps

Answer

1000 amps

Question 4

Which of the following is the SI unit of resistance?

Accepted Answer

Ohm

Answer

Volt

Answer

Ampere

Answer

Watt

Question 5

Which of the following is NOT a limitation of Ohm's Law?

Accepted Answer

Can be applied to AC circuits

Answer

Applicable only to linear resistors

Answer

Neglects temperature effects on resistance

Answer

Assumes constant resistance

Question 6

Identify a good conductor of electricity:

Accepted Answer

Copper

Answer

Plastic

Answer

Wood

Answer

Rubber

Question 7

A 10-ohm resistor is connected to a 12-volt battery. Calculate the current flowing through the resistor.

Accepted Answer

1.2 amps

Answer

0.12 amps

Answer

12 amps

Answer

120 amps

Question 8

If the voltage across a resistor increases while the resistance remains constant, what effect does this have on the current?

Accepted Answer

Increases

Answer

Decreases

Answer

Stays the same

Answer

Varies randomly

Question 9

What is the SI unit of measurement for electrical resistance?

Accepted Answer

Ohms

Answer

Volts

Answer

Amps

Answer

Watts

Question 10

Which of the following materials exhibits high electrical conductivity?

Accepted Answer

Copper

Answer

Wood

Answer

Plastic

Answer

Rubber

Question 11

What is the primary purpose of a resistor in an electrical circuit?

Accepted Answer

To decrease current

Answer

To increase voltage

Answer

To store energy

Answer

To amplify signals

Question 12

State the relationship between electrical resistance and conductivity.

Accepted Answer

Resistance is inversely proportional to conductivity.

Answer

Resistance is directly proportional to conductivity.

Answer

Resistance is independent of conductivity.

Answer

Conductivity is directly proportional to resistance.

Question 13

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

Accepted Answer

Voltage, current, and resistance

Answer

Power, current, and resistance

Answer

Voltage, capacitance, and inductance

Answer

Current, frequency, and inductance

Question 14

If the voltage across a resistor is doubled, what happens to the current flowing through the resistor (assuming resistance remains constant)?

Accepted Answer

Doubles

Answer

Halves

Answer

Remains the same

Answer

Cannot be determined without knowing the resistance value

Question 15

A resistor with a resistance of 10 ohms has a voltage drop of 20 volts across it. Calculate the current flowing through the resistor.

Accepted Answer

2 amps

Answer

0.5 amps

Answer

20 amps

Answer

50 amps

Question 16

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

Accepted Answer

Ohm

Answer

Volt

Answer

Ampere

Answer

Watt

Question 17

Which of the following is not a type of resistor?

Accepted Answer

Capacitor

Answer

Fixed resistor

Answer

Variable resistor

Answer

Thermistor

Question 18

What is the primary function of a resistor in an electrical circuit?

Accepted Answer

Limit current flow

Answer

Store electrical energy

Answer

Amplify signals

Answer

Generate heat

Question 19

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 applied

Question 20

According to Ohm's Law, which equation correctly describes the relationship between current (I), voltage (V), and resistance (R)?

Accepted Answer

I = V / R

Answer

I = R / V

Answer

V = I / R

Answer

V = R / I

Question 21

Which factors influence the resistance of a conductor?

Accepted Answer

Length, cross-sectional area, and material

Answer

Current and cross-sectional area

Answer

Voltage and length

Answer

Voltage and temperature

Question 22

A resistor has a color code of brown-black-orange. What is its resistance value?

Accepted Answer

10,000 ohms

Answer

100,000 ohms

Answer

100 ohms

Answer

1,000 ohms

Question 23

Which formula calculates power (P) in an electrical circuit?

Accepted Answer

P = V * I

Answer

P = V / R

Answer

P = R / I

Answer

P = I * R

Question 24

Which of the following is not a unit of resistance?

Accepted Answer

Ampere

Answer

Kilohm

Answer

Ohm

Answer

Megaohm

Question 25

A wire with a resistance of 6 ohms is cut into two equal parts. What is the resistance of each part?

Accepted Answer

3 ohms

Answer

1 ohm

Answer

6 ohms

Question 26

Which limitation applies to Ohm's Law?

Accepted Answer

It is not applicable to non-ohmic materials.

Answer

It is only applicable to low voltage circuits.

Answer

It does not consider current effects.

Answer

It is only applicable to AC circuits.

Question 27

In a series circuit, how is the total resistance calculated?

Accepted Answer

By adding the individual resistances.

Answer

By subtracting the individual resistances.

Answer

By dividing the individual resistances.

Answer

By multiplying the individual resistances.