Found 1006 Articles for Electronics & Electrical

When the EMF is induced by self and mutual inductance occur simultaneously, the relative polarities of these two induced EMFs must be determined before making any circuit calculations. The induced EMF in a coil due to mutual inductance may either aid or oppose the induced EMF due to self-inductance depending upon the sense of the windings and the directions of the currents in the coils.Dot Notation or Dot RuleThe dot rule or dot convention may be stated as follows −If both currents enter the dotted ends of the coupled coils or if both currents enter undotted ends, then the sign ... Read More

B-H Curve or Magnetisation CurveThe B-H curve or magnetisation curve is the graph plotted between magnetic flux density (B) and magnetising force (H). The B-H curve indicates the manner in which the magnetic flux density varies with the change in magnetising force.The following figure shows the general shape of B-H curve of a magnetic material. The nonlinearity of the curve shows that the relative permeability μr of a magnetic material is not constant but varies depending upon the magnetic flux density.Magnetic HysteresisThe phenomenon of lagging of magnetic flux density (B) behind the magnetising force (H) in a magnetic material subjected ... Read More

B-H Curve or Magnetisation CurveThe B-H curve or magnetisation curve is the graph plotted between magnetic flux density (B) and magnetising force (H). The B-H curve indicates the manner in which the magnetic flux density varies with the change in magnetising force.The following figure shows the general shape of B-H curve of a magnetic material. The nonlinearity of the curve shows that the relative permeability $μ_{r}$ of a magnetic material is not constant but varies depending upon the magnetic flux density.Magnetic HysteresisThe phenomenon of lagging of magnetic flux density (B) behind the magnetising force (H) in a magnetic material subjected ... Read More

Magnetic CircuitA magnetic circuit is defined as a closed path followed by the magnetic flux.A magnetic circuit consists of a core of materials having high permeability like iron, soft steel etc. It is because these materials offer very small opposition to the flow of magnetic flux.Consider a coil of N turns wound on an iron core (see the figure). When an electric current I is passes through the coil, magnetic flux (ψ) is set up in the core. This magnetic flux follows a closed path ABCDA and hence ABCDA is the magnetic circuit.In a magnetic circuit, the amount of magnetic ... Read More

When two inductors are joined end to end i.e. finishing end of one joined to the starting end of the other and same current flows through both the inductors, then the inductors are said to be connected in series.Inductors in Series with No Mutual InductanceConsider two inductors of inductance $L_{1}$ and $L_{2}$ connected in series (see the figure). Assume that the mutual inductance between the two coils is zero. Let $L_{T}$ being the total equivalent inductance of the series connected inductors.Suppose at any instant the current is changing at the rate of di/dt. The total induced emf in the circuit ... Read More

Induced EMFWhen a magnetic flux linking a conductor or coil changes, an electromotive force (EMF) is induced in the conductor or coil, is known as induced EMF. Depending upon the way of bringing the change in magnetic flux, the induced EMF is of two types −Statically Induced EMFDynamically Induced EMFStatically Induced EMFWhen the conductor is stationary and the magnetic field is changing, the induced EMF in such a way is known as statically induced EMF (as in a transformer). It is so called because the EMF is induced in a conductor which is stationary. The statically induced EMF can also ... Read More

Hysteresis LossWhen a magnetic material is subjected to cycle of magnetisation (i.e. it is magnetised first in one direction and then in the other), a power loss occurs due to molecular friction in the material i.e. the magnetic domains of the material resist being turned first in one direction and then in the other. Therefore, energy is required in the material to overcome this opposition. This loss being in the form of heat and is termed as hysteresis loss. The effect of hysteresis loss is the rise of temperature of the machine.The formula for the calculation of hysteresis loss is ... Read More

When electric current is passed through a conductor, heat is generated in the conductor. This effect of electric current is known as heating effect of electric current.In practice, when electric current is passed through the element of an electric heater, the element of the heater becomes red hot, because the electrical energy is converted into the heat energy. This is called heating effect of electric current and is used in manufacturing of many heating appliances like electric iron, electric kettle etc.Cause of Heating Effect of Electric CurrentWhen a potential difference is applied across the ends of a conductor, the free ... Read More

When a current carrying conductor is placed at right angles to a magnetic field, it is found that a force acts on the conductor in a direction perpendicular to the direction of both the magnetic field and the current.ExplanationConsider a straight conductor carrying a current of I amperes. If the magnetic flux density is B, the effective length of the conductor is l and θ is the angle which the conductor makes with the direction of the magnetic field.It has been found by experiments that the magnitude of the force (F) acting on the conductor is directly proportional to −Magnetic ... Read More

An English electrical engineer and physicist Sir John Ambrose Fleming established two rules, known as Fleming's Left-Hand Rule and Fleming's Right-Hand Rule which are widely used in electrical machines.When a current carrying conductor is placed in a magnetic field, a mechanical force acts on the conductor. The direction this force is determined by Fleming's Left-Hand Rule. The left-hand rule is mainly applicable in electric motors.Also, when a conductor is moved in a magnetic field, an emf is induced in the conductor due to which an electric current flows in the conductor. The direction this induced current is determined by Fleming's ... Read More