AMP: Full Form, Measurement, Derived units - Embibe
  • Written By Team_Embibe
  • Last Modified 19-07-2022
  • Written By Team_Embibe
  • Last Modified 19-07-2022

Amp Full Form

Amp Full Form: The Amp full form in English is Ampere. The Amp full form in Hindi is विद्युत धारा की इकाई. The Amp is the SI (International System of Units) unit of electrical current through which it is measured. The symbol of Ampere is A. The value of elementary charge e (electric charge carried by a single proton) is 1.60217663410-19. 1 Amp is defined as the rate of flow of elementary charge through a conductor in 1 second. The SI unit of charge and time is Coulomb (C) and Second (s) simultaneously. Therefore, 1 Amp is equated as,

                                                          1 Amp = 1 C/s 


The Amp is named after the French mathematician and physicist Andre-Marie Ampere. He studied electromagnetism and laid the foundation of electrodynamics. He is considered the father of electromagnetism along with the Danish physicist Hans Christian Oersted. The Amp has been an internationally recognised unit since 1908.

Amp Measurement

There are two basic measurement methods of current in Amp. These methods are explained below:

  • D’Arsonval Metre/ Galvanometer: It is an analogue type measuring instrument that measures the value of current through the deflection of a moving coil. The indicating system consists of a light coil of wire suspended from a metallic ribbon between the poles of permanent magnets. When a direct current flows through the coil, it generates a magnetic field of equal strength. This magnetic strength opposes the permanent magnet. The coil then rotates under the action of torque produced and moves the pointer indicating the value of a current in the coil.
  • Ampere Metres/ Ammeters: An ammeter is based on the theory of Ohm’s Law. Ohm’s law states that the current passing through a conductor between two points in an electrical circuit is directly proportional to the potential difference between the same points and inversely proportional to the resistance between them, on the temperature being constant.

                                i.e. I = V/ R


           I = current in Amp flowing through the conductor  

                      V= potential difference in Volts between two points 

                      R= resistance in Ohms between them

Table of Amp Derived Units

The units that are derived from Amp having their special names are given below:

Dimension Unit Symbol Meaning SI Base Units
Electric charge Coulomb C Amp Second A s
Voltage Volt V Joule per Coulomb or Watt per Amp kg m 2 s-3 A-1
Resistance Ohm Volt per Amp or watt per Amp2 kg m2 s-3 A-2
Conductance Siemens S Amp per volt or inverse ohm s3 A2 kg-1 m-2
Inductance Henry H Ohm second kg m2 s-2 A-2
Capacitance Farad F Coulomb per volt s4 A2 kg-1 m-2
Magnetic flux Weber Wb Volt second kg m2 s-2 A-1
Magnetic flux density Tesla T Weber per square metre kg s-2 A-1

Volts Amps Resistance Triangle

The three terms volts, Amps and resistance are interrelated and form a triangular structure in an electrical circuit. It is often known as the VIR triangle. This VIR triangle helps to remember the basic law of the electrical circuit i.e. Ohm’s Law. 


                                                          I              R

To calculate voltage, put the finger at V and multiply IR,      V=IR

To calculate current, put the finger at I and divide V/R,                  I=V/R

To calculate resistance, put the finger at R and divide V/I             R= V/I

FAQs on Amp

Question 1. What is the full form of Amp?
Answer: The Amp full form in English is Ampere. In Hindi, Amp full form is विद्युत धारा की इकाई.

Question 2. What is 1 Amp current?
Answer: 1 Amp current is defined as the rate of flow of elementary charge in a conductor through a fixed point in 1 second.

Question 3. How volt is related to ohm and Amp?
Answer: The three entities are related to one another through the VIR triangle. Whenever a current of 1 Amp flows across the resistance of 1 ohm in a circuit, the voltage drop across that resistor will be 1 volt.

Question 4. How can we measure Amp?
Answer: We can measure amperes in a conductor by using D’Arsonval Galvanometer or other ammeters. 

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