Circuits and Symbols

The flow of electrons through a circuit Electricity A closed circuit allows electricity to flow An open circuit has a break so electricity cannot flow

Electricity by-passes a device in the circuit Electricity always follows the path of least resistance Short circuits can drain batteries, melt insulation, and start fires Short Circuits Paper, plastic, or even an air gap can cause electrons to stop flowing.

A short-cut method of drawing circuits Circuit Diagrams The diagram on the right is a faster way of drawing the circuit on the left. What direction is the flow?

Imagining how water would work in a circuit can help you predict how electricity will work Electricity & Water Valve = Switch Pipes = Wire Pump = Battery Water Wheel = Light Bulb

As a group draw a water circuit on your white board that contains a pump, a valve, and a water wheel You Try

Now replace the water components of the previous circuit with the electrical components. Does it work? You Try

Does the bulb light? Why or why not? Exit Ticket