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Dry cells and (most) alkaline batteries are examples of primary batteries. The second type is rechargeable and is called a secondary battery. Examples of secondary batteries include nickel-cadmium (NiCd), lead acid, and lithium ion batteries.

The time taken in seconds by an alternating quantity to complete one cycle is known as time period or periodic time and is denoted by T.

Electrical injury is a physiological reaction caused by electric current passing through the body.Electric shock occurs upon contact of a (human) body part with any source of electricity that causes a sufficient magnitude of current to pass through the victim’s flesh, viscera or hair. Physical contact with energized wiring or devices is the most common cause of an electric shock. In cases of exposure to high voltages, such as on a power transmission tower, physical contact with energized wiring or objects may not be necessary to cause electric shock, as the voltage may be sufficient to “jump” the air gap between the electrical device and the victim.

The purpose of bedding is to protect the sheath from mechanical injury due to armouring. You can think it like a shock absorber. Armouring is provided over the bedding to protect the cable from mechanical injury during its handling and lying. It consists of one or two layers of galvanized steel wire or steel tape.

C-band (Comprise) is a portion of the microwave band ranging from 4-8 GHz, and a wavelength of around 5 cm. The C-band is commonly used for satellite communications. The bands available for satellite communications are 3.4-4.2 GHz (space-to-Earth) and 5.925-6.725 GHz (Earth-to-space).

The dielectric strength of air is approximately 3 kV/mm.

A fluorescent lamp tube is filled with a gas containing low-pressure mercury vapor and argon, xenon, neon, or krypton.

Thus a wave winding has always two parallel paths irrespective of the no. of poles and only two brushes are required.This type of winding is used for low-current, high voltage application.

Zener diode is widely used as a shunt (parallel resistance) regulator to regulate the voltage in the circuit so as the voltage connot burn the circuit. It is used in various ways such as voltage shifter, voltage regulator and waveform clipper.

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