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The henry (symbol: H) is the unit of electrical inductance in the International System of Units (SI). [1] If a current of 1 ampere flowing through a coil produces flux linkage of 1 weber turn, that coil has a self-inductance of 1 henry. The unit is named after Joseph Henry (1797–1878), the American scientist who discovered electromagnetic induction independently of and at about the same ...
Inductance is the tendency of an electrical conductor to oppose a change in the electric current flowing through it. The electric current produces a magnetic field around the conductor.
An interesting point to note is the fact that the measured self-inductance of the coil does not change even on taking dielectric loss within the capacitor into account. Another advantage of using this modified bridge is that unlike the variable capacitor used in Maxwell bridge , it makes use of a fixed capacitor which is relatively quite cheaper.
Pages for logged out editors learn more. Contributions; Talk; Self-inductance
The magnetic flux is defined by a surface integral: [12] =, where dA is an element of the surface Σ enclosed by the wire loop, B is the magnetic field. The dot product B · d A corresponds to an infinitesimal amount of magnetic flux.
is the short-circuit measurement of primary or secondary inductance; is the corresponding open-circuit measurement of primary or secondary inductance; Other transformer parameters like leakage inductance and mutual inductance which cannot be directly measured may be defined in terms of k.
The inductance considered in this context refers to a bare conductor, not the inductance of a coil used as a circuit element. The inductance of a coil is dominated by the mutual inductance between the turns of the coil which increases its inductance according to the square of the number of turns.
If the resistance is not constant, the previous equation cannot be called Ohm's law, but it can still be used as a definition of static/DC resistance. [4] Ohm's law is an empirical relation which accurately describes the conductivity of the vast majority of electrically conductive materials over many orders of magnitude of current.