http://www.youtube.com/watch?v=E27XDNf2c
xc
Ohm’s Law explains the
relationship between voltage (V
or E), current (I) and resistance
(R)
 Used by electricians, automotive
technicians, stereo installers



It is the push or pressure behind
current flow through a circuit,
and is measured in (V) volts.

Current refers to the
quantity/volume of electrical
flow. Measured in Amps (A)

Resistance to the flow of the
current. Measured in Ohms
1. Assuming the resistance does not
change:
As voltage increases, current increases.
as voltage decreases, current decreases.




2. Assuming the voltage does not change:
As resistance increases, current decreases.
As resistance decreases, current increases.
What is Voltage?
 What is Current?
 What is Resistance?



http://www.youtube.com/watch?v=eZ9Xk0Ll
n5Y&feature=related
Stop at 1 Min mark


V (E) = I x R
I=V
R
R=V
I



Battery voltage is 12V
Current is Amp ?
Resistance 2 Ohm



Voltage is 12V
Current is 4 Amps
Resistance Ohms ?
Multi meters/ DVOM



Why do we need resistors
To decrease the amount of voltage
applied to a component
The value of the resistor is marked on the
body using coloured rings
What is Voltage?
 What is Current?
 What is Resistance?

http://www.youtube.com/watch?v=nj7ewZmG3
eo&feature=related

http://www.youtube.com/watch?v=YB_JCU
w9SoU&feature=related

What is a load
It is a any electric load on a circuit that does
work.

Example: Power windows, light bulbs, motors.




Series circuit :
One pathway for current to flow.
Example: Old Christmas lights


More then one path way for current to
flow.
Used in most electrical vehicle circuits.
12
What is Voltage?
 What is Current?
 What is Resistance?
 What are wiring diagrams?
 What are the different circuits
and there characteristics?
