A device that can measure the resistance directly is known as an ohmmeter. There are two types of ohmmeters asSeries Types OhmmeterShunt Type OhmmeterSeries Type OhmmeterCircuit DiagramThe circuit of a series type ohmmeter consists of a D’Arsonval galvanometer (PMMC meter) connected in series with a resistance and a battery. It ... Read More

When the two coils are arranged in such a way that a change of current in one coil causes an emf to be induced in the other, the coils are said to have mutual inductance. The mutual inductance is denoted letter M and measured in Henry.Consider two coils, coil 1 ... Read More

The Magnetomotive force (MMF) is defined as the work done in moving a unit magnetic pole once around the magnetic circuit. It is a magnetic pressure that tends to set up magnetic flux in a magnetic circuit. Mathematically, the mmf is the product of current and number of turns of ... Read More

The magnetic field intensity is the force acting on a unit test north-pole (i.e., N-pole of 1 Wb) placed at a point in the magnetic field. It is denoted by H.The magnetic field intensity is a vector quantity, possessing both magnitude and direction.The magnetic field intensity is also known by ... Read More

Distribution SystemThe distribution system is defined as the part of electrical power system which distributes electrical power for local use. On the basis of voltage level a distribution system can be classified in two categories viz.Low Voltage (LV) Distribution SystemHigh Voltage (HV) Distribution SystemLow Voltage (LV) Distribution SystemThe distribution system ... Read More

Single Phase SystemInstantaneous PowerThe instantaneous power in an AC circuit is defined as the product of instantaneous voltage (v) across the element and instantaneous current (i) through the element and is denoted by lower case letter p.Instantaneous Power, $\mathrm{p=v\times\:i}$Since, the values of instantaneous voltage and instantaneous current changes from instant ... Read More

The magnetic flux density is the measure of amount of magnetic flux in each square meter of the magnetic field. Therefore, the magnetic flux density is defined as the magnetic flux passing normally (at 90°) per unit area and is denoted by B, i.e., Magnetic flux density, $$B=\frac{\phi}{A}$$Where, Φ is ... Read More

Capacitance - DefinitionThe ability of a capacitor to store charge is known as its capacitance. In other word, the capacitance can also be defined as the property of a material by virtue of it opposes the any change in voltage applied across it.Capacitance: FormulaExperimentally, it has been found that, the ... Read More

Electromechanical RelayAn electromechanical relay is a type of relay which function using a magnetic field produced by an electromagnetic coil when a control signal is applied to it. It is called as electromechanical since it has moving contacts in the output circuit which are operated by applying an electrical signal.Electromechanical ... Read More

Electricity tariff is defined as the rate at which electrical energy is supplied to a consumer.Types of Tariff in ElectricityThe commonly used electricity tariffs are as follows −Simple Tariff – When there is a fixed rate per unit of energy consumed, it is known as simple tariff or uniform rate ... Read More