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Wheatstone Bridge
AP Physics 2 · Unit 11 DC Circuits
Learning Objectives
Balance condition: R₁/R₂ = R₃/Rx
Zero galvanometer current at balance
Determine unknown resistance
Understand sensitivity of bridge circuits
Balance Condition
R₁/R₂ = R₃/Rx
Rx = R₂·R₃/R₁
I_galvanometer = 0 at balance
Tags
Wheatstone
bridge
resistance
AP Physics 2
I_gal
0 mA
Status
—
R₁ (Ω)
100
R₂ (Ω)
200
R₃ (Ω)
150
Rx (Unknown, Ω)
300
V_source (V)
12
Analysis
R₁/R₂
0
R₃/Rx
0
I_gal
0
Rx (for balance)
0