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Questions and Answers
What is the condition for a Wheatstone bridge to be considered balanced?
What is the condition for a Wheatstone bridge to be considered balanced?
- $I_g = I_1 + I_2$
- $R_1/R_2 = R_3/R_4$
- $I_g = 0$ (correct)
- $R_1 + R_2 = R_3 + R_4$
In the context of the Wheatstone bridge, what does the galvanometer measure?
In the context of the Wheatstone bridge, what does the galvanometer measure?
- The total current in the circuit
- The resistance in the battery arm
- The voltage across the resistors
- The current flowing through it (correct)
Which equation represents the first Kirchhoff's loop rule applied to the Wheatstone bridge?
Which equation represents the first Kirchhoff's loop rule applied to the Wheatstone bridge?
- $I_1 + I_3 = I_2 + I_4$
- $-I_1 R_1 + I_2 R_2 = 0$ (correct)
- $I_1 R_1 - I_2 R_2 = 0$
- $I_1 R_1 + I_2 R_2 = 0$
Which resistance value must remain constant to determine an unknown resistance using the Wheatstone bridge?
Which resistance value must remain constant to determine an unknown resistance using the Wheatstone bridge?
What happens when the Wheatstone bridge is not balanced?
What happens when the Wheatstone bridge is not balanced?
When applying Kirchhoff’s junction rule at junctions D and B in a Wheatstone bridge, what relationship holds true?
When applying Kirchhoff’s junction rule at junctions D and B in a Wheatstone bridge, what relationship holds true?
What role does the battery play in a Wheatstone bridge circuit?
What role does the battery play in a Wheatstone bridge circuit?
What is the primary function of the galvanometer in a Wheatstone bridge circuit?
What is the primary function of the galvanometer in a Wheatstone bridge circuit?
In a Wheatstone bridge, what happens when the resistors are not equal in ratio?
In a Wheatstone bridge, what happens when the resistors are not equal in ratio?
What are the two arms called in a Wheatstone bridge circuit?
What are the two arms called in a Wheatstone bridge circuit?
What condition leads to I_g being equal to zero in a Wheatstone bridge?
What condition leads to I_g being equal to zero in a Wheatstone bridge?
Which rule is applied at junctions D and B to analyze the Wheatstone bridge?
Which rule is applied at junctions D and B to analyze the Wheatstone bridge?
Flashcards
Wheatstone Bridge
Wheatstone Bridge
A circuit with four resistors that are connected in a bridge-like structure. It is used to measure an unknown resistance.
Balanced Bridge
Balanced Bridge
The condition where the galvanometer in a Wheatstone bridge shows no deflection, indicating that the bridge is balanced and no current flows through the galvanometer.
Galvanometer Arm
Galvanometer Arm
The line connecting points B and D in a Wheatstone bridge that contains the galvanometer, which detects current flow through the circuit.
Battery Arm
Battery Arm
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Meter Bridge
Meter Bridge
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Balance Condition
Balance Condition
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Ig
Ig
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Kirchhoff's Junction Rule
Kirchhoff's Junction Rule
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What is a Wheatstone Bridge?
What is a Wheatstone Bridge?
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What is a balanced Wheatstone Bridge?
What is a balanced Wheatstone Bridge?
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What is the galvanometer arm in a Wheatstone Bridge?
What is the galvanometer arm in a Wheatstone Bridge?
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What is the battery arm in a Wheatstone Bridge?
What is the battery arm in a Wheatstone Bridge?
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What is Kirchhoff's Junction Rule?
What is Kirchhoff's Junction Rule?
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Study Notes
Wheatstone Bridge
- A Wheatstone bridge is a circuit used to measure unknown resistances.
- It has four resistors (R₁, R₂, R₃, R₄) arranged in a diamond shape.
- A voltage source (battery) is connected between opposite corners (A and C), often referred to as the battery arm.
- A galvanometer (G) is connected between the other two corners (B and D), often referred to as the galvanometer arm.
- A balanced bridge occurs when there's no current flowing through the galvanometer (Ig = 0).
- The bridge circuit can have current flow through all resistors and the galvanometer, but is most useful when the galvanometer shows no deflection (Ig = 0).
Balance Condition
- For a balanced bridge, the current through the galvanometer is zero (Ig = 0).
- Kirchhoff's junction rule, applied at junctions B and D, gives I₁ = I₃ and I₂ = I₄.
- Applying Kirchhoff's loop rule to loops ADBA and CBDC yields the balance condition.
- (R₁/R₂) = (R₃/R₄)
- This equation shows the relationship between the four resistors for a balanced bridge.
Determining Unknown Resistance
- The balance condition allows for measuring an unknown resistance (R₄).
- Known resistors (R₁, R₂) are placed in arms one and two.
- The resistance (R₃) in the third arm is adjusted until the galvanometer shows no deflection (a null reading).
- The balance condition then provides a way to calculate the unknown resistance using the equation.
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Description
This quiz covers the fundamentals of the Wheatstone bridge, a circuit used to measure unknown resistances. Participants will explore its configuration, balance condition, and how to determine unknown resistor values using known resistances. Test your understanding of this crucial concept in electrical circuits!
