MOSFET
Also: metal-oxide-semiconductor field-effect transistor
A voltage-controlled transistor often used as an efficient electronic switch.
Gate-source voltage controls channel resistance; safe design checks threshold versus full enhancement, charge, VDS, current, and thermal limits.
Example A logic-level N-MOSFET can switch a low-side load when its gate is driven adequately.
Common misconception Gate-threshold voltage is not the voltage that guarantees low on-resistance.