When performing experiments in an electricity lab, you will use two very common, similar-looking devices: the Ammeter and the Voltmeter. While they look the same on the outside, their internal construction and purpose are completely different.
An ideal ammeter has 0 ohms resistance, while an ideal voltmeter has infinite ohms resistance.
Both devices are essentially modified versions of a sensitive device called a Galvanometer.
| Feature | Ammeter | Voltmeter |
|---|---|---|
| Function | Measures Current. | Measures Potential Difference. |
| Symbol | A circle with 'A'. | A circle with 'V'. |
| Connection | Series. | Parallel. |
| Resistance | Very low. | Very high. |
Because an ammeter has very low resistance, connecting it in parallel will cause a massive amount of current to flow through it instantly, which will create a short circuit and likely burn out the ammeter.
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