Ammeter vs Voltmeter — Difference (with Table & FAQs)
Ammeter vs Voltmeter compared side by side — a 6-row comparison table, 4 key points and 3 exam FAQs. Class 10 Physics, free and no sign-up.
TL;DR: Ammeter vs Voltmeter compared side by side — a 6-row comparison table, 4 key points and 3 exam FAQs. Class 10 Physics, free and no sign-up.
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
The main difference between Ammeter and Voltmeter: An ammeter measures electric current flowing through a circuit and is connected in series. A voltmeter measures electric potential difference across two po
Ammeter vs Voltmeter — Comparison Table
| Basis | Ammeter | Voltmeter |
|---|---|---|
| Measures | Electric current (in amperes) | Electric potential difference (in volts) |
| Connection | Connected in series with circuit | Connected in parallel across component |
| Internal Resistance | Very low internal resistance | Very high internal resistance |
| Effect on Circuit | Minimal effect on circuit behavior | Draws minimal current from circuit |
| Purpose | Measures current flowing through component | Measures voltage across component |
| Example | Measures 2.5 A flowing through a resistor | Measures 5 V potential difference across battery |
Key Points
- Ammeter and voltmeter are modified galvanometers for different measurements
- Reversing ammeter and voltmeter connections damages both instruments
- Ammeter cannot measure voltage; voltmeter cannot measure current
- Both instruments are essential for circuit analysis
Frequently Asked Questions
What is the difference between an ammeter and a voltmeter?
An ammeter measures the current flowing through a circuit, in amperes. A voltmeter measures the potential difference between two points, in volts.
How is each connected in a circuit?
An ammeter is connected in series, so the whole current passes through it. A voltmeter is connected in parallel across the component whose potential difference is being measured.
Why does an ammeter have low resistance and a voltmeter high resistance?
An ammeter must not reduce the current it is measuring, so its resistance is kept very low. A voltmeter must draw almost no current away from the component, so its resistance is kept very high. Connecting an ammeter in parallel can short the circuit and damage it.