The relation between electric current, magnetic fields and physical forces was first noted by Hans Christian Ørsted in 1820, who observed a compass needle was deflected from … See more

A picoammeter, or pico ammeter, measures very low electric current, usually from the picoampere range at the lower end to the milliampere range at the upper end. Picoammeters are used where the current being measured is below the limits of sensitivity of … See more

• Clamp meter
• Class of accuracy in electrical measurements
• Electric circuit
• Electrical measurements
• Electrical current#Measurement See more

Some instruments are panel meters, meant to be mounted on some sort of control panel. Of these, the flat, horizontal or vertical type is often called an edgewise meter.
Moving-coil
The See more

Ammeters must be connected in series with the circuit to be measured. For relatively small currents (up to a few amperes), an ammeter may pass the whole of the circuit current. For larger direct currents, a shunt resistor carries most of the circuit … See more

• Kuphaldt, Tony R. (2000–2023). "Chapter 8: DC metering circuits". Lessons in Electric Circuits. Vol. 1: DC (free e‑book ed.). {{cite book}}: |website= ignored (help) — from Lessons in Electric Circuits series main page See more