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Section 2: Current
Explain the relationship among voltage,
current and resistance in a simple series circuit.
I can explain Ohm’s Law.
I can calculate voltage, current and resistance
using Ohm’s Law.
Ohm’s Law explains the
relationship between voltage (V
or E), current (I) and resistance
 Used by electricians, automotive
technicians, stereo installers, etc.
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.
V = IxR
Battery voltage is 12V
Resistance 2 Ohm
Voltage is 12V
Current is 4 Amps
Resistance in 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 colored rings.
What is Voltage?
 What is Current?
 What is Resistance?
 Calculations on worksheet