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The most fundamental formulas in electronics are Ohms Law and Watts Law:
Ohms Law: V = I*R
Watts Law: P=I*V
With the two laws and a little algebra, you can calculate any of these variables if you have two of the other variables.
This resource is a printable version of this handy chart that has done the algebra and shows how to calculate Power, Current, Voltage or Resistance from any two of the 4 properties.
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The following is another circle trick that is easy to remember and helps with many of the formulas
To remember the circles better, drop the math operators and view it spatially:
The most fundamental formulas in electronics are Ohms Law and Watts Law:
Ohms Law: V = I*R
Watts Law: P=I*V
P=Power in Watts
I=Current in Amps
V=Voltage in Volts
R=Resistance in Ohms
With the two laws and a little algebra, you can calculate any of these variables if you have two of the other variables.
This resource is a printable version of this handy chart that has done the algebra and shows how to calculate Power, Current, Voltage or Resistance from any two of the 4 properties.
------------------------------------------------------------------------------------------------------------------
The following is another circle trick that is easy to remember and helps with many of the formulas
To remember the circles better, drop the math operators and view it spatially: