Question

A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F, because the method involves

• A. a combination of cells, galvanometer and resistances
• B. cells
• C. potential gradients
• D. a condition of no current flow through the galvanometer

Answer 1

The correct option is D a condition of no current flow through the galvanometer

A potentiometer is an accurate and versatile device to make electrical measurements of emf because the method involves a condition of no current flow through the galvanometer, the device can be used to measure potential difference, internal resistance of a cell and compare emf's of two sources.