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An AC generator equipped with a device called a “commutator” can produce direct current. Use of a device called a “rectifier” that converts AC to DC. Batteries provide DC, which is generated from a chemical reaction inside of the battery.

Buchholz relay is used for the protection of transformers from the faults occurring inside the transformer. Short circuit faults such as inter turn faults, incipient winding faults, and core faults may occur due to the impulse breakdown of the insulating oil or simply the transformer oil.

Because hydropower plants can generate power to the grid immediately, they provide essential back-up power during major electricity outages or disruptions. In addition to a sustainable fuel source, hydropower efforts produce a number of benefits, such as flood control, irrigation, and water supply.

Nuclear fuel is the fuel that is used in a nuclear reactor to sustain a nuclear chain reaction. These fuels are fissile, and the most common nuclear fuels are the radioactive metals uranium-235 and plutonium-239.

The name usually refers to a hammer with a 2-to-4-pound (0.91 to 1.81 kg) head and a 10-inch (250 mm) handle, also called a “single-jack” hammer because it was used by one person drilling, holding the chisel in one hand and the hammer in the other.

Gravity control. In gravity controlled instruments, a small weight is attached to the moving system in such a way that it produces a controlling torque, when the moving system is in deflected position.

Vapor lamps. Sodium vapor and mercury vapor lamps emit yellow and bright blue light, respectively. They are very efficient, and provide high-intensity light suitable for illuminating large, open areas.

With its familiar “push and twist” action, the “bayonet cap” (also known as BC or B22d cap) is used on most regular light bulbs. It is 22mm in diameter and with two locating lugs. This is done to prevent wrong connections.

A choke is generally used in series with fluorescent tube circuit to make high voltage for conduction.
The purpose of the choke is to provide a very high voltage initially between the filaments.
The choke serves the purpose of stabilizing the electric flow of current in the fluorescent tube.
Without a choke the current would keep increasing without any limitation until it destroys the fluorescent tube.

Transformers providing three-phase secondary power, which are used for residential service in the European system, have three primary windings and are attached to all three primary phase wires. The windings are almost always connected in a ‘wye’ configuration, with the ends of the three windings connected and grounded.
A distribution transformer or service transformer is a transformer that provides the final voltage transformation in the electric power distribution system, stepping down the voltage used in the distribution lines to the level used by the customer.
Delta-Star transformers are commonly used for distribution because they provide a way to step down the voltage for consumer use.
The primary delta winding allows for the transmission of three-phase power at high voltages, which is efficient for long-distance transmission.

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