Ohm's Law is a fundamental electronics principle that explains how voltage, resistance, and current relate to each other. Together with the principle of power, these are core underlying principles that explain why certain value components are chosen in circuits.
Ohm's Law is expressed as the following equation:
Here, V is voltage measured in volts, I (capital i) is the current measured in amps, and R is resistance measured in Ohms, commonly prefixed with Ω, the Greek symbol for Omega.
On the other hand, power is expressed as the following equation:
Here, P is power measured in Watts, I (capital i) is the current measured in amps (same as in Ohm's Law), and R is resistance measured in Ohms (same as in Ohm's Law).
The take-home principle regarding these equations is that you cannot change a single parameter in an electronic circuit without affecting another. This means that components are selected...