Flick the upper left switch to make the motor turn either right or left. The resistor mimics a 9V DC motor. Watch the polarity of the voltage on the V meter as you use the switch. The polarity determines the motor going either right or left.
I prefer this method over a transistor H bridge because with relays you don't need any extra components. Also you don't need to worry about high currents heating up the trannies.
In real life you would of course just use one relay for left and one for right since you can get a relay with double N.O. spst switches in one. Because here in EC the relays only have one N.O. spst switch per relay I had to parallel two of them to create the two switches.
