Understanding the Wheatstone Bridge

What is the primary purpose of a Wheatstone Bridge?

• To measure voltage across a battery

• To determine the resistance of an unknown resistor

• To increase the current in a circuit

• To decrease the voltage in a circuit

In a Wheatstone Bridge, what is the role of the voltmeter?

• To measure the potential difference between two points

• To allow current to pass through the bridge

• To increase the voltage across the resistors

• To measure the total resistance of the circuit

How is the current through the left side of the Wheatstone Bridge circuit calculated?

• By dividing the battery voltage by the sum of resistances R1 and R3

• By multiplying the battery voltage by the sum of resistances R1 and R3

• By subtracting the resistance R3 from R1

• By adding the battery voltage to the resistance R1

What happens to the voltage across resistor R1 in the left side of the circuit?

• It remains constant regardless of current

• It is the difference between the battery voltage and R1

• It is the sum of the battery voltage and R1

• It is equal to the current through the left side times R1

How is the total resistance on the right side of the Wheatstone Bridge circuit determined?

• By adding resistances R2 and R4

• By subtracting R4 from R2

• By dividing R2 by R4

• By multiplying R2 and R4

What is the function of the voltmeter reading in a Wheatstone Bridge?

• It shows the total current in the circuit

• It indicates the difference in voltage between two points

• It measures the power consumed by the resistors

• It calculates the total resistance of the circuit

What happens when resistor R4 has no resistance in a Wheatstone Bridge?

• The circuit reduces to three resistors

• The voltmeter reads the voltage across R1

• The voltmeter reads zero voltage

• The circuit behaves as if it has four resistors

What occurs when resistor R4 has infinite resistance?

• The voltmeter reads the voltage across R3

• The voltmeter reads the voltage across R1

• The circuit reduces to two resistors

• The circuit behaves as if it has no resistors

Why is a Wheatstone Bridge more accurate for measuring resistance compared to a simple circuit?

• It measures current instead of voltage

• It uses more resistors for better accuracy

• It does not depend on the battery voltage or internal resistance

• It has a built-in error correction mechanism

What is the significance of plotting bridge voltage versus resistor R2?

• It indicates the total resistance of the circuit

• It shows a non-linear relationship

• It helps in calculating the battery voltage

• It reveals a linear trend for back-calculating R4