Electricity is like a flow of water that passes through things always following the path of lesser strength. p>    

Current is caused by the naked eye invisible movement of some electron-generated particles. p>     p>

As water flows through gravity from top to bottom, current flows into materials that, by their characteristics, allow current to pass more easily. p>    

Other materials instead of creating more resistance to current passage and therefore are called insulators are: wood, rubber, plastics, glass. p>    

The voltage measurement unit is the volt strong> whose symbol is a capital V strong> p>