You may have heard the old adage that it isn't the voltage that kills you - it's the current. That is true. If that path happens to be across your heart, you will probably die. So here is some information that will help you understand the fundamentals of electricity so that you can fix an electrical circuit or appliance without tempting the grim reaper. First, electricity flows in a similar fashion to water.
Electrical voltage is akin to pressure of water in a pipe or hose.
It is really that simple. When you increase the pressure in a pipe, the water comes out faster. Now on to some practical stuff. Let's talk about a car battery. If you ever accidently shorted out a car battery's terminal like you might do with jumper cables, you saw a spark that looked like Willie the Welder was working.