Question

Is a MOSFET AC or DC?

Answer 1

A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is a type of semiconductor device that can be used in both AC (Alternating Current) and DC (Direct Current) circuits. It is not strictly AC or DC—its role depends on the type of circuit and how it's used. Here's how:

1. DC Circuits: In DC applications, a MOSFET is typically used as a switch or amplifier. For example, in power supplies, MOSFETs are used to control the flow of DC current, acting as a switch to turn the current on or off.
   

1. AC Circuits: In AC applications, MOSFETs can be used in switching circuits, like in inverters (which convert DC to AC) or in amplifiers. For AC signals, the MOSFET helps modulate the voltage or current to handle the varying direction of current (alternating current).
   

Summary:

1. DC: MOSFETs can be used to control DC current, such as in power supplies.
   

1. AC: MOSFETs can switch or amplify AC signals in circuits like inverters.
   

So, it depends on how it's used in the circuit.