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Which law states that the current flowing through a conductor is directly proportional to the potential difference across its ends, provided the temperature remains constant?
Faraday's Law
Ohm's Law
Coulomb's Law
Kirchhoff's Law
Ohm's Law
Ohm's Law states that the electric current flowing through a metallic conductor is directly proportional to the potential difference across its ends, provided that the physical conditions such as temperature remain constant. Mathematically, it is expressed as V=IimesR, where V is potential difference, I is current, and R is resistance.
Ohm's Law states that the electric current flowing through a metallic conductor is directly proportional to the potential difference across its ends, provided that the physical conditions such as temperature remain constant. Mathematically, it is expressed as V=IimesR, where V is potential difference, I is current, and R is resistance.
V=IimesR тАФ Ohm's Law relationship between voltage, current, and resistance
I=RVтАЛ тАФ Expression for current in terms of voltage and resistance
When a potential difference is applied across a conductor, an electric field is established inside it. This field exerts a force on the free electrons, causing them to drift in a specific direction and creating an electric current that is proportional to the applied voltage.
Applies to linear or ohmic conductors under constant temperature.
The ratio of potential difference to current remains constant, representing resistance (R).
Non-ohmic devices like diodes and transistors do not obey Ohm's Law.
Simplifies the analysis of complex linear electrical and electronic circuits.
Enables straightforward calculation of voltage, current, or resistance when two parameters are known.
Not applicable to non-linear devices such as semiconductor diodes and thermistors.
Fails at extreme temperatures where material resistance changes significantly with current heating.
Circuit design and analysis in electrical and electronics engineering.
Determining resistor values in power distribution and signal conditioning.
Option A (Faraday's Law) deals with electromagnetic induction.
Option C (Coulomb's Law) governs the electrostatic force between stationary point charges.
Option D (Kirchhoff's Law) relates to conservation of charge and energy in electrical circuits.
B is correct тАФ Ohm's Law defines the linear relationship between the potential difference across a conductor and the current flowing through it at constant temperature.
Remember that Ohm's Law assumes physical conditions like temperature remain constant; if temperature increases, resistance typically changes in metallic conductors.