Current Electricity

Two fundamental laws for circuit analysis

Two fundamental laws for circuit analysis: (1) Current Law (Junction Rule): Algebraic sum of currents at any junction is zero (∑I = 0), based on charg

A four

A four-arm bridge circuit with resistances P, Q, R, S arranged in a quadrilateral. Balance condition: P/Q = S/R, achieved when galvanometer current is

Practical form of Wheatstone bridge using

Practical form of Wheatstone bridge using a uniform wire of 1-meter length. Unknown resistance X is related to known resistance R by X = (ℓₓ/ℓᵣ)R, whe

Based on the principle that potential

Based on the principle that potential difference across a uniform wire is proportional to its length when constant current flows through it. Potential

Conversion to Ammeter

Conversion to Ammeter: Connect low resistance shunt S in parallel. Shunt formula: S = GIₓ/(I-Iₓ) = G/(n-1) where n = I/Iₓ is the multiplication factor