Is ohm's law a law

Answer 1

Yes. Ohm's law is generally thought of as a basic law of electricity, but electricity is, in the language of physics, a part of the electromagnetic force. The electromagnetic force is one of the four basic forces in the universe (allong with gravity, the strong force (called the strong interaction) and the weak force (called the weak interaction). That's the electromagneticforce. Not the electric force or the magnetic force, but the electromagnetic force. And Ohm's law is a most fundamental expression of the relationship of voltage, resistance and current in an electrical circuit. In that light, Ohm's law is a general law of the electromagnetic force. Note: Some science teachers might try to split hairs here and say that Ohm's law is an electrical law and not an electromagnetic law, but this is one of those questions that might be said to have two answers. As regards what was said in the first paragraph, nothing in it is incorrect. Nothing at all.

Another Answer

Absolutely NOT! For Ohm's Law to be valid, the ratio of a circuit's voltage to current must be constant for variations in voltage. In other words, if you were to plot current against voltage for variations in voltage, you should end up with a straight-line graph. In fact, this is rarely the case. In most cases, you will end up with a curved line which confirms Ohm's Law does NOT apply.

Most materials and electronic devices (diodes, etc.) are classified as being 'non linear' or 'non-ohmic', meaning they DO NOT OBEY OHM'S LAW.

So Ohm's Law is most certainly NOT a universal law and, in fact, barely qualifies as being a law at all!

Answer 2

Yes. The complete ohms law (usually when talking about ohms law you will say I = V*R) even takes into account power transmitted through the air or other medium from transmission lines/antennas.

Answer

Absolutely not. A circuit only obeys Ohm's Law if there is a straight-line relationship between current and voltage -in other words, ONLY if the current to voltage ratio is constant for changes in voltage. For example, a filament lamp doesn't obey Ohm's Law, because its resistance increases as the voltage applied to it increases. However, the ratio of voltage to currentwill give always give you resistance (as defined by the ohm, NOT by Ohm's Law), regardless of whether the circuit obeys Ohm's Law or not -but ONLY for that particular ratio. If the ratio changes, so does the resistance.

Answer 3

No. It is more like a definition of resistance. As such, it is always true - but note that some devices have variable resistance (depending on the current, for example).

Another Answer

Ohm's Law states that 'the current flowing through a conductor at constant temperature is directly proportional to the potential difference across that conductor'.

Ohm's Law is by no means a universal law, and only applies to those conductors or devices where the ratio of voltage to current is constant over a wide range of potential differences. These materials are termed 'ohmic' or 'linear'; those materials and devices that do not obey Ohm's Law (and there are a great many!) are termed 'non-ohmic' or 'non-linear'. Examples of non-ohmic materials and devices include tungsten (lamp filaments), diodes, etc.

The ratio of voltage to current is termed resistance (R = E/I), and is derived from the definition of the ohm, and not (as many people think) from Ohm's Law. This equation can be applied to both ohmic and non-ohmic materials and devices.

Read more: What_is_Ohms_Law
No, because it doesn't apply to all circuits.

Answer 4

yes (a physical law not a legal law)

Answer

It is, but many consider that it shouldn't be! This is because Ohm's 'Law' only applies to a limited range of materials.

We call those materials 'linear' or 'ohmic', and they obey Ohm's Law because the ratio of their voltage to current remains constant over a wide range of voltage variation. Linear materials include most, but no all, conductors.

But other materials, which we call 'non-linear' or 'non-ohmic', do not obey Ohm's Law. The ratio of their voltage to current varies when different voltages are applied. Non-linear materials include tungsten, carbon, semiconductor diodes, vacuum tubes, electrolytes, and conducting gases.

Whether a material is 'linear' or 'non-linear', you can always determine their resistance for any particular combination of voltage and current, using the equation R = E/I. This equation is usually mistakenly called the 'Ohm's Law equation' but, in fact, is derived from the definition of the ohm, and NOT from Ohm's Law. Ohm's Law makes no mention of resistance, and definitely no mention of any 'equation'; it simply says that "The current in a conductor, at constant temperature, is directly proportional to the potential difference across its ends" -no mention of resistance, and no mention of any equation!

Answer 5

It's not really 'Ohm's Law', but the equivalent is: reluctance = mmf / flux

Answer 6

Yes indeed. Thanks for stopping by and sharing.