Online simulation of the n-моп-транзистор circuit

This is a simple model of an n-type MOSFET. The source is at ground, and the gate and drain voltages can be adjusted using the sliders on the right. Normally no current flows if the gate voltage is below the threshold voltage (1.5 V). When you raise it above this, current starts to flow. When the gate and drain voltages are high enough, the MOSFET is in saturation, and the current stays constant regardless of the drain voltage. If you lower the drain voltage relative to the gate, the MOSFET is in the linear region, and the current is roughly linear with respect to the drain voltage. By slowly moving the drain voltage slider back and forth, you should see the boundary between the linear and saturation regions. Try this with other gate voltage settings.

This page is a utility for simulating n-моп-транзистор online with specified initial values.