/diy/ - Do It Yourself

Complete noob here. So excuse the question, but how does one use a MOSFET as a sort of relay? i.e. to drive, say, a spark plug coil?

I'd like to use a solid state driver connected to a micro controller to make sparks at different intervals depending on input.

5 minutes in paint to make a diagram is all i ask. I'm a visual learner.