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Which law states that the current flowing through a conductor is directly proportional to the potential difference across its ends?
Faraday's Law
Ohm's Law
Kirchhoff's Law
Coulomb's Law
Ohm's Law
Ohm's Law states that at a constant temperature, the current I flowing through a metallic conductor is directly proportional to the potential difference V applied across its ends. This relationship holds provided physical conditions like temperature and pressure remain unchanged.
Ohm's Law states that at a constant temperature, the current I flowing through a metallic conductor is directly proportional to the potential difference V applied across its ends. This relationship holds provided physical conditions like temperature and pressure remain unchanged.
Think of water pressure in a hose; the higher the pressure (voltage), the more water (current) flows out, provided the hose size (resistance) remains the same.
VIR (V = I * R) - 'Very Important Rule'.
V=I├ЧR тАФ Ohm's Law relationship between voltage, current, and resistance.
R=╧БAlтАЛ тАФ Relation of resistance to resistivity, length, and area.
According to the drift velocity model, applying a potential difference creates an electric field that exerts a force on free electrons, causing them to move and constitute current. The ratio of potential difference to current, defined as resistance R, represents the opposition to this flow due to collisions between electrons and ions in the lattice.
Ohm's Law is only applicable to 'Ohmic' conductors (e.g., metallic resistors).
Non-ohmic devices like semiconductors and diodes do not follow a linear VтИТI graph.
The SI unit of resistance is the Ohm (╬й).
Allows calculation of current, voltage, or resistance in simple circuits.
Essential for designing basic electrical circuits.
Does not apply to non-ohmic devices like transistors or lamps.
Performance changes if the temperature of the conductor varies.
Design of electrical heating elements.
Calculation of current limits for circuit protection devices like fuses.
Resistance R is constant for a metallic conductor at a constant temperature.
Faraday's Law relates to electromagnetic induction, Kirchhoff's Laws relate to circuit node/loop analysis, and Coulomb's Law relates to electrostatic forces between point charges.
B is correct тАФ Ohm's Law defines the linear relationship between voltage and current in a conductor under constant physical conditions.
Always remember that in V=IR, R is constant only for a fixed temperature; if the problem mentions a change in temperature, assume the material's resistance might change.
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