Ohm’s Law explains the relationship between voltage (V or E), current (I) and resistance (R)
Used by electricians, automotive technicians, stereo installers
Ohm’s Law
Where: I = current (amperes, A)
E = voltage (volts, V)
R = resistance (ohms, )
RE
I
Ohm’s Law: Resistance and Resistors
In many conductors, the resistance is independent of the voltage; this relationship is called Ohm’s law. Materials that do not follow Ohm’s law are called non-ohmic.
Unit of resistance: the ohm, Ω.
1 Ω = 1 V/A.
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. 1. Assuming the resistance does not change:
2. As voltage increases, current increases.3. as voltage decreases, current
decreases.
4. 2. Assuming the voltage does not change:
5. As resistance increases, current decreases.
6. As resistance decreases, current increases.
V (E) = I x R
I = V R
R = V I
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