ABSTRACT
A few of the most common sensors will be introduced in this chapter. Details and some less common sensors will follow after definitions and a bit of magnetic theory, which can be skipped. Any magnetic field sensor can be used as a current sensor and there are some exotic examples, such as quantum effects in low-temperature superconductors used to measure currents in neurons within the brain. This discussion is limited to measurement of currents in wires with commercially practical devices.
