OHM’S LAW AND ELECTRICAL POWER

OHM’S LAW “Provided the physical conditions, such as temperature, are kept constant, the resistance is constant over a wide range of applied potential differences, and therefore the potential difference is directly proportional to the current flowing.”

OHMIC DEVICES (OHMIC CONDUCTORS) Those devices which obey the linear relationship of Ohm’s Law at all potential differences Temperature of this device will NOT change due to the heating effect of the current as voltage changes No device is truly completely Ohmic—it’s an ideal resistor Most devices would be considered Non-Ohmic

Non-Ohmic vs. Ohmic devices—Current vs. Voltage