Electronics  Electronics is based on the flow of electrons from one point to another in a circuit.  A Circuit is a loop of a conductor that permits electrons to flow around like racecars on a racetrack.

Electricity  Even though electricity is one phenomenon, we must look at 3 factors to determine the power being used

1.) Resistance  What is trying to slow or stop the electron/race car  Unit of measurement is called Ohms and is represented by the Ω

2.) Voltage  What is making the electron/race car move around the circuit  Unit of measurement is voltage and is represented by a V

3.) Current  The number of electrons/race cars per unit of time moving along the circuit.  The unit of measure is amperage (amps) and is represented by amps or A

Ohm’s law Shows the relation between all 3  Voltage ÷ Current = Resistance  Voltage ÷ Resistance = Current  Current ×Resistance = Voltage  Example: 9 V applied to a 4.5 Ω light bulb will equal how man amps of current flowing through the light bulb?

Electricity water analogy  Electricity can be compared to water flow. Examples river, pressure washer Work together as a group to support or refute this statement. Explain and give examples of what would be the Resistance, Current, Electron, Voltage in the water flow example.

High Current low Voltage

Low Current High Voltage

Watts the Unit of Power  Watts = Current × Voltage So although the river has less voltage it may still have the same amount of power as the pressure washer. Imagine a watermill spinning on the river and another by the water pressure.