Galvanometer vs Ammeter — Difference (with Table & FAQs)
Galvanometer is a sensitive device detecting small currents. Ammeter measures large currents in electric circuits.
TL;DR: Galvanometer is a sensitive device detecting small currents. Ammeter measures large currents in electric circuits.
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
The main difference between Galvanometer and Ammeter: Galvanometer is a sensitive device detecting small currents. Ammeter measures large currents in electric circuits.
Galvanometer vs Ammeter — Comparison Table
| Basis | Galvanometer | Ammeter |
|---|---|---|
| Function | Detects small currents | Measures large currents |
| Sensitivity | Very sensitive | Less sensitive |
| Current Range | Micro to milliamps | Milliamps to amperes |
| Internal Resistance | Very high | Very low |
| Construction | Simple coil in magnetic field | Galvanometer with shunt |
| Connection | Can be connected carefully | Must be in series |
Key Points
- Ammeter is essentially galvanometer with low-resistance shunt
- Galvanometer would burn out if too much current flows
- Ammeter has negligible internal resistance
- Both work on same principle of current-deflection
Frequently Asked Questions
What is the difference between a galvanometer and an ammeter?
A galvanometer detects and measures very small currents and can show the direction of current. An ammeter measures larger currents in amperes and is made by connecting a low-resistance shunt across a galvanometer.
How is an ammeter connected in a circuit?
An ammeter is always connected in series with the circuit, and it has very low resistance so it does not change the current being measured.
Can a galvanometer be converted into an ammeter?
Yes — by connecting a small resistance (called a shunt) in parallel with the galvanometer.