What is the significance of ohm's law?

Answer 1

Answer: Ohm's law is the most basic and most useful electrical equation. It explains the relationship between voltage (E) measured in volts, current (I) measured in amps, and resistance (R) measured in ohms. Without going into too much detail, Ohm's law plays a key PC role in Parallel versus Series Wiring. Parallel wiring is connecting components to a source so that they share the same voltage while Series wiring is connecting components to a source so that they share the same current.

Answer 2

Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and inversely proportional to the resistance between them.

If you're designing a circuit it's as well to know this law so that you don't use the wrong voltage or allow too high a current to pass.

Answer 3

Ohm's Law is a law of constant proportionality. It only applies to those conductors and other components whose ratio of voltage to current remains constant for variations in voltage. It does not apply to conductors or components whose ratio of voltage to current changes for variations in voltage. In this sense, Ohm's Law is not a universal law.

Conductors and other devices which obey Ohm's Law are termed 'linear' or 'ohmic'; those that do not (the majority, in fact!) are termed 'non-linear' or 'non-ohmic'. Most, but not all metals, are linear (e.g. tungsten is not) whereas most electronic components such as diodes, electrolytes, and gases are non-linear.

The ratio of voltage to current is, of course, resistance. And we can use this ratio to determine what the resistance of a device happens to be for that particular ratio, even for devices that do not obey Ohm's Law. For non-linear devices, the ratio continuously changes for variations in voltage.

It is quite incorrect to define Ohm's Law as, "resistance equals voltage divided by current", as this equation is derived from the definition of the ohm, and NOT from Ohm's Law -which makes absolutely no reference to resistance.

Answer 4

Ohm's law does not apply to unilateral networks. In an electrical network where currents are moving in a single direction, there is no flow of electrons in the opposite direction due to the fact there is no looping pathways between cyclic voltammetry power sources and sensors.