Ohm's Law 

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Resistance ...
At a given temperature, the potential difference or Voltage drop (V) across a resistor (R) is proportional to the current (I) flowing through it.
CalculationsR = V / I
Ohm's Law TriangleThis triangle helps some people to remember that
To remember this triangle, try this: The Vase on the table Is Red

The ammeter measures the current flowing through the resistor. The voltmeter measures the voltage across the resistor. Assume that the meters are ideal and they have no effect on the circuit ...
Flash PracticeTry a few Ohm's Law calculations ... 
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