1. An electrical current will only flow if there is a complete pathway through which the electrons can move. This pathway is called an electrical circuit. An electrical circuit is made up of: 1) A source of electrons 2) A conductor through which the electrons can flow 3) The switch that stops or starts the flow of electrons 4) A load which is used to change the electrical energy into some other form of energy. 1 2 1 3 4

2. Radios (sound energy) Blenders (kinetic energy) Light bulbs (radiant energy) Space heater (thermal energy)

3. Open & Closed Circuits There are 2 types of circuits: 1) Open circuits: are formed when the flow of electrons is interrupted and they can no longer move past a certain point. 2) Closed circuits: are formed when there IS a flow of electrons.

4. Circuit Symbols To simplify the drawing of an electric circuit, symbols are used.

5. Design Challenge!