A great example is this simple wireless AC current detector from [NEW PEW]. The circuit is a simple one, and a classic. The spring from a ballpoint pen is soldered to the base of a BC547 ...

The measurement is floating (not direct contact to the conductor), and therefore it can be applied to any part of the circuit, even where the potential of the conductor is very high. A shunt resistor ...

Current is a measure of how much electric charge flows through a circuit. The more charge that flows, the bigger the current. Current is measured in amperes. The symbol for ampere is A.

These sensors operate by measuring changes in capacitance ... noise shaping to achieve high resolution. Current Conveyor: A type of electronic circuit that can transfer current from one node ...