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 ...

If it’s DC, the easiest way is to use a shunt resistor and measure the voltage across it, and for AC you could use a current transformer ... an amplification circuit, and the ability to be ...

In addition to the measurement symbols, one symbol you must always be aware of when using a multimeter is the Ground (GND) ...

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.

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 ...