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Electrical Technology Basics of electricity and electrical technology Electricity Atoms – The smallest unit of each element Electrons – negatively charged particles in atoms Ions – charged atoms or molecules Magnets – A metal with opposite charges on each side. Magnets can be used to create electricity. Static Electricity Lightning Charge Build up Energy Release Path of Least Resistance Electric Circuits Electricity flowing through a substance is called an electric current. Conductors – Low resistance Insulators – High resistance Schematic Symbols A drawing of an electric circuit is called a schematic. Symbols Resistor Battery Switch Source Ohms Law V – voltage or electrical potential I – current or electrical flow R – resistance or load Ohms law states: V = IR Series and Parallel Circuits Series circuit - has only one path through which the electricity can flow. Parallel circuit - has multiple paths through which the electricity can flow. Switches Switches are used to control circuits. Switches connect or disconnect all or part of a circuit. Switches come in many forms. SPST SPDT DPST DPDT