ohms law
TRANSCRIPT
OHMS LAW
Ohm’s Law
Voltage
Current
Resistance
Resistor
Circuit
Example
Quiz
What is ohms law?
Ohm’s Law explains the relationship between voltage (V or E), current (I) and resistance (R)
Used by electricians, automotive technicians, stereo installers
CURRENT
Current refers to the quantity/volume of electrical flow. Measured in Amps (A)
VOLTAGE (V)
It is the push or pressure behind current flow through a circuit, and is measured in (V) volts.
RESISTANCE
Resistance to the flow of the current. Measured in Ohms
Chart
General Rule.
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.
How do we used Ohms law
• V (E) = I x R
• I = V R
R = V I
How do calculate?
Battery voltage is 12VCurrent is Amp ?Resistance 2 Ohm
How to calculate?
Voltage is 12VCurrent is 4 AmpsResistance Ohms ?
What can we use to measure?
Multi meters/ DVOM
Resistors
Why do we need resistorsTo decrease the amount of voltage
applied to a component The value of the resistor is marked on the
body using coloured rings
Resistors
Resistor color chart
Load
What is a loadIt is a any electric load on a circuit that
does work.Example: Power windows, light bulbs,
motors.
Different types of circuitSeries circuit : One pathway for current to flow.Example: Old Christmas lights
Parallel Circuit More then one path way for current to flow.Used in most electrical vehicle circuits.
Series and Parallel Circuits
12
Parallel resistance circuit
What it looks like
1997 Headlight circuit
QUIZ
QUIZ
What is Voltage?What is Current?What is Resistance?What are wiring diagrams?What are the different circuits and there characteristics?