Ohm's law explains the relationship between voltage, current, and resistance in many materials, but it may not hold true in nonohmic substances or under certain conditions such as excessive current flow through a resistor. Understanding when Ohm's law applies is crucial in analyzing electrical circuits.
Ohm's law states that many substances exhibit a direct relationship between the current passing through them and the voltage applied across them, given by V = IR where V is voltage, I is current, and R is resistance. However, Ohm's law may not be obeyed in nonohmic materials where the relationship between voltage and current is not linear, such as in semiconductors or devices like transistors.
An example of a condition where Ohm's law may not be obeyed is if too large a current flows through a resistor, causing it to heat up excessively, leading to a violation of Ohm's law.
Recognizing when Ohm's law applies and when it does not is essential in understanding the behavior of different materials and devices in electrical circuits.
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