The starting circuit consists of your battery, ignition switch, starter solenoid, and starter. Your ignition switch is a rotary switch that when turned to one of its 3 positions connects and disconnects certain contact terminals located on its backside. In the “start” position, it connects the Battery, Ignition, Rectifier, Accessory, and Start Terminals.
Since liquids exert force equally in all directions we can multiply the force it gives by increasing the surface area in which we want the liquid to push against. Typically we apply this principle in a hydraulic cylinder. The greater the surface area at the end of the cylinder, the more force gets exerted on the moving piston.