![]() Because the current between Source and Drain (V DS) will be high, the resistance of the Drain to Source channel must be very low. When the MOSFET is used as a switch, it operates in 'saturation mode' and so conducts heavily when switched on. The load is switched on by applying a small voltage potential difference between the MOSFET Gate and Source, the actual value and polarity of this voltage depends on the MOSFET type chosen. Over recent years their use has grown enormously, replacing electro-mechanical relays to switch electrical loads in many applications. They form the essential link between low power electronics and higher power 'real world' applications. ![]() Both N and P channel Power MOSFETs (though mainly N channel) are widely used for switching DC loads of many types. ![]()
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