Ohm's Law
From FIRSTwiki
Ohm's law (named after its discoverer Georg Ohm) states that the ratio of the potential difference (voltage V) to the current (I) flowing through a device is a constant (resistance R). Namely,
It is worth noting that this is an empirical law, i.e., not mathematically derived. Also, it's title of law is largely historical. As is often the case in physics, this equation is for an ideal resistor; further, there are many devices for which the law isn't even an approximation. These are called non-ohmic devices, such as diodes (on which modern computing depends). In actuality, resistance is dependent on temperature change. However, despite these non-ideal situations, the Ohm's law equation is still somewhat valid, only R is no longer a constant.
