Resistor Basics

What is the unit of resistance?

• Ohm (Ω)

• Volt

• Ampere

• Joule

What is the formula to calculate resistance?

• R = V / I

• R = V - I

• R = I / V

• R = V x I

What is the color code for a 10 ohm resistor?

• brown, black, black, gold

• red

• green

• blue

How does the resistance of a wire change with its length?

• The resistance of a wire increases with its length.

• The resistance of a wire decreases with its length.

• The resistance of a wire remains constant regardless of its length.

• The resistance of a wire is not affected by its length.

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

• The purpose of a resistor is to increase the voltage in a circuit.

• Resistors are used to amplify the current in a circuit.

• Resistors are used to store electrical energy in a circuit.

• The purpose of a resistor in an electrical circuit is to limit the flow of current.

What is the difference between fixed resistors and variable resistors?

• Fixed resistors are more expensive than variable resistors.

• Fixed resistors have a higher power rating than variable resistors.

• Fixed resistors have a set resistance value, while variable resistors allow resistance adjustment.

• Fixed resistors are used in digital circuits, while variable resistors are used in analog circuits.

Explain the concept of resistance in terms of electron flow.

• Resistance is the ability of electrons to move freely without any obstacles

• Resistance in terms of electron flow refers to the hindrance encountered by electrons as they move through a material due to collisions with atoms.

• Resistance is the speed at which electrons flow through a material

• Resistance is the measure of the total number of electrons in a material

What happens to the current in a circuit if the resistance is increased?

• The current in the circuit becomes negative

• The current in the circuit remains the same

• The current in the circuit increases

• The current in the circuit decreases

How does temperature affect the resistance of a resistor?

• Resistance increases with temperature.

• Resistance remains constant with temperature.

• Resistance decreases with temperature.

• Resistance is not affected by temperature.

Why are resistors important in electronic circuits?

• Resistors amplify current flow in circuits

• Resistors are only used for aesthetic purposes in circuits

• Resistors limit current flow, control voltage levels, divide voltages, and protect components.

• Resistors have no impact on voltage levels