What type of sensor is a Hall effect sensor used to measure?

A Hall effect sensor primarily measures the magnitude of a magnetic field. It operates on the principle that a voltage is generated when a conductive material is placed in a magnetic field and current flows through it. This voltage is directly related to the strength of the magnetic field, making it an effective tool for detecting and measuring magnetic fields in various applications, such as determining the position of a crankshaft or camshaft in an engine.

In contrast, the other choices focus on different types of measurements that do not relate to the primary function of a Hall effect sensor. Temperature variations are typically measured using thermocouples or thermistors. Fluid pressure is measured with pressure transducers or gauges designed for that purpose. Combustion efficiency involves measuring the ratio of fuel to air and analyzing exhaust emissions, which requires different sensors entirely, such as oxygen sensors or lambda sensors. Therefore, the use of a Hall effect sensor is specifically aligned with magnetic field measurement.