Measuring the resistance of a solution (Wheatstone bridge)विलयन का प्रतिरोध मापना (व्हीटस्टोन ब्रिज)Measuring the resistance of a solution (Wheatstone bridge)

NCERT Fig 2.5 · Class 12 Chemistry · Chapter 2 · interactive diagram

Parts and what they mean

• R₂ — conductivity cell (unknown resistance) (R₂ — चालकता सेल (अज्ञात प्रतिरोध)) — The solution in the conductivity cell is the unknown resistance.
• R₁ — variable resistance (R₁ — परिवर्ती प्रतिरोध) — Adjusted until the detector shows no current (bridge balanced).
• R₃ — fixed resistance (R₃ — स्थिर प्रतिरोध) — Known resistance.
• R₄ — fixed resistance (R₄ — स्थिर प्रतिरोध) — Known resistance.
• P — detector (headphone or electronic device) (P — संसूचक (हेडफ़ोन या इलेक्ट्रॉनिक युक्ति)) — Bridge is balanced when no current passes through P.
• O — oscillator (AC source, 550–5000 Hz) (O — दोलित्र (AC स्रोत, 550–5000 Hz)) — AC is used because DC would change the composition of the solution by electrolysis.
• Balance condition (संतुलन शर्त) — R₂ = R₁R₄/R₃. Then κ = G*/R.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 2.5. Report a mistake