# Basic Electrical Engineering | Voltage | LV | LT | MV | HV | HT | EHV | Electrical Design Class

## What is voltage?

Voltage, Electric Potential Difference, Electric Pressure or Electric Tension. Voltage is the difference in electric potential between two points. Voltage can be defined as the work needed per unit of charge to move a test charge between the two points.

Unit

As per the International System of Units (SI units), the derived unit for voltage is volt. The term “volt” is derived in honor of the famous Italian physicist Alessandro Volta (1745–1827), who invented the first chemical battery known as the voltaic pile. Voltage is symbolically denoted by V.

In SI units, work per unit charge is expressed as joules per coulomb, where 1 volt = 1 joule (of work) per 1 coulomb (of charge).

## Basic Electrical Engineering | Voltage | LV | LT | MV | HV | HT | EHV | Electrical Design Class

How voltage is created?

The electric voltage between points can be caused by electric charge, by an electric current through a magnetic field, by time-varying magnetic fields, or some combination of these three

Instrument for measurement

Instruments for measuring voltages include the voltmeter and the oscilloscope.

Common Voltage In life

DC: A common voltage for AA or AAA batteries is 1.5 volts (DC). A common voltage for automobile batteries is 12 volts (DC).

AC: Common voltages supplied by the utility power supplying system may vary from country to country. In some countries, it may be from 110 to 120 volts (AC) and in others, it may be from 220 to 240 volts (AC). Similarly, the voltage used in electric power transmission lines used to distribute electricity from power stations can be several hundred times greater than consumer voltages, typically 110 to 1200 kV (AC).

Supply voltage

Low Tension/ Voltage (LV/ LT): below 250V ( In India standard is 240V)

Medium Voltage (MV): below 650V ( In India standard is 415V)

High tension (HV/HT): below 33 KV

Extra-high-voltage (EHV) : above 33 KV

Note: The distribution Transformer designed in India is for 433V secondary terminal voltage but when it comes to the load side it will be only 415 V as per standards. Similarly, all 3 phases generated and motor voltage should be 415V

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