Don't let that quote scare you. It is not as scholarly as it sounds.
Ohms Law is a set of formulas used in electronics to calculate an unknown amount of current, voltage or reistance. It was named after the German physicist Georg Simon Ohm. Born 1787. Died 1854. Knowledge of this Law is
often underestimated
by beginners. I have talked to people that can
design complex circuitry
and microprocessor systems that have said, Ohms
Law? What's that? Unless you know this basic fundamental building block of electronics, you will never have a strong foundation to hold up the electronics towers you will be constructing in the future. Learn Ohms Law. Learn it inside and out!
Ohm's Law is a formulation of the relationship of voltage, current, and resistance, expressed as: Where:
If we knew the battery was supplying 12 volt of pressure (voltage), and there was a resistive load of 1 Ohm placed in series, the current would be: If we knew the battery was supplying 12V and the current being generated was 12A, then the Resistance would be:
To determine a missing value, cover it with your finger. The horizontal line in the middle means to divide the two remaining values. The "X" in the bottom section of the circle means to multiply the remaining values. If you are calculating voltage, cover it and you have I X R left (V= I times R). If you are calculating
amperage, cover
it, and you have V divided by R left (I=V/R).
Note:
The letter
E is sometimes used instead of V for
voltage.
