Electrometer

An electrometer is an electrical instrument for measuring electric charge or electrical potential difference. There are many different types, ranging from historical hand-made instruments to high-precision electronic devices. Modern electrometers based on vacuum tube or solid state technology can be used to measure extremely small currents down to 1 femtoampere.

Related Topics:
Electrical - Electric charge - Potential difference - Femto

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A simpler but related instrument, the electroscope, works on similar principles but indicates only the relative magnitudes of voltages or charges.

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