THIS LESSON IS…. ELECTRIC! 

ELECTRICITY:	The flow of electrons

In a battery there is a negative and positive charge.
The negative charges (electrons) want to rush through wires in order to get together with the positive charges (protons).
If the wires are too short then the electrons will rush too quickly and KABAAM! (short circuit) or they could rush too quickly and blow out an LED.

VOLTAGE (E): 	The electric potential between two points
How badly these charges want to get together
				Measured in Volts

			AA battery = 1.5 volts		Car battery = 12 volts

CURRENT (I):	Flow of electrical charge
			How quickly they will rush to get together
			Measured in Amperes (amps)
			Sometimes measures in mA where 0.001 A = 1 mA

So…
The voltage is how badly the boys (electrons)
want to join the girls (protons).
The current is how easy it is for the boys to get
from where they are to where the girls are.

If either of these are too high then…..
KABAAM!!

So how do we control these things?

RESISTANCE (R):  	Can reduce the current and voltage
				Measured in ohms     

OHM’S LAWS:	Allow us to see how voltage (E), current (I) and resistance (R) are related.

E = I x R
R = E / I
I = E / R