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  2. Ohm's law - Wikipedia

    en.wikipedia.org/wiki/Ohm's_law

    The two resistors follow Ohm's law: The plot is a straight line through the origin. The other two devices do not follow Ohm's law. There are, however, components of electrical circuits which do not obey Ohm's law; that is, their relationship between current and voltage (their I–V curve) is nonlinear (or non-ohmic).

  3. Reciprocity (electromagnetism) - Wikipedia

    en.wikipedia.org/wiki/Reciprocity_(electromagnetism)

    The above argument shows explicitly why the surface terms can cancel, but lacks generality. Alternatively, one can treat the case of lossless surrounding media with radiation boundary conditions imposed via the limiting absorption principle (LAP): Taking the limit as the losses (the imaginary part of ε ) go to zero.

  4. Electrical resistance and conductance - Wikipedia

    en.wikipedia.org/wiki/Electrical_resistance_and...

    Ohm's law is satisfied when the graph is a straight line through the origin. Therefore, the two resistors are ohmic, but the diode and battery are not. For many materials, the current I through the material is proportional to the voltage V applied across it: over a wide range of voltages and currents. Therefore, the resistance and conductance ...

  5. International System of Electrical and Magnetic Units

    en.wikipedia.org/wiki/International_System_of...

    The 1893 system of units was overdefined, as can be seen from an examination of Ohm's law: V = I R. By Ohm's law, knowing any two of the physical quantities V, I or R (potential difference, current or resistance) will define the third, and yet the 1893 system defines the units for all three quantities. With improvements in measurement ...

  6. List of physics mnemonics - Wikipedia

    en.wikipedia.org/wiki/List_of_physics_mnemonics

    A Magic Triangle image mnemonic - when the terms of Ohm's law are arranged in this configuration, covering the unknown gives the formula in terms of the remaining parameters. It can be adapted to similar equations e.g. F = ma, v = fλ, E = mcΔT, V = π r 2 h and τ = rF sinθ.

  7. System equivalence - Wikipedia

    en.wikipedia.org/wiki/System_equivalence

    On the other hand, flow systems may be easier described by the hydraulic analogy or the diffusion equation. For example, Ohm's law was said to be inspired by Fourier's law (as well as the work of C.-L. Navier). [2] [3] [4] Other laws include Fick's laws of diffusion and generalized transport problems. The most important idea is the flux, or ...

  8. Covariant formulation of classical electromagnetism - Wikipedia

    en.wikipedia.org/wiki/Covariant_formulation_of...

    The covariant formulation of classical electromagnetism refers to ways of writing the laws of classical electromagnetism (in particular, Maxwell's equations and the Lorentz force) in a form that is manifestly invariant under Lorentz transformations, in the formalism of special relativity using rectilinear inertial coordinate systems.

  9. Duality (electrical circuits) - Wikipedia

    en.wikipedia.org/wiki/Duality_(electrical_circuits)

    In electrical engineering, electrical terms are associated into pairs called duals.A dual of a relationship is formed by interchanging voltage and current in an expression.

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