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To make a current flow through a resistance there must be a voltage across that resistance. Ohm's Law shows the relationship between the voltage (V), current (I) and resistance (R). It can be written in three ways:
The Ohm's Law equations work if you use V, A and , or if you use V, mA and k. You must not mix these sets of units in the equations so you may need to convert between mA and A or k and .
The VIR triangle
Write down V, I and R in a triangle like the one in the yellow box on the right.
Ohm's Law CalculationsUse this method to guide you through calculations:
It should be Very Easy Now!
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