# Difference between voltage and potential difference pdf

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Published: 20.05.2021  The required amount of energy to move the unit charge from one point to another is known as Voltage. In other words, voltage is defined as the difference between electric potentials. EMF or Electromotive Force is the energy supply to the charge by a battery cell.

I have it written down in my notebook like this: Potential difference is electrical energy produced by the cell. Voltage is the amount of energy used by a component lightbulb. Are they correct? Then what would total charge Q be?

## 3.2 Electric Potential and Potential Difference

Recall that earlier we defined electric field to be a quantity independent of the test charge in a given system, which would nonetheless allow us to calculate the force that would result on an arbitrary test charge. The default assumption in the absence of other information is that the test charge is positive. We briefly defined a field for gravity, but gravity is always attractive, whereas the electric force can be either attractive or repulsive. Therefore, although potential energy is perfectly adequate in a gravitational system, it is convenient to define a quantity that allows us to calculate the work on a charge independent of the magnitude of the charge. Keep in mind that whenever a voltage is quoted, it is understood to be the potential difference between two points. For example, every battery has two terminals, and its voltage is the potential difference between them. More fundamentally, the point you choose to be zero volts is arbitrary. ## What is the difference between potential difference and voltage?

Voltage , electric potential difference , electromotive force emf, electric pressure or electric tension is the difference in electric potential between two points, which in a static electric field is defined as the work needed per unit of charge to move a test charge between the two points. In the International System of Units , the derived unit for voltage potential difference is named volt. The old SI definition for volt used power and current ; starting in , the quantum Hall and Josephson effect were used, and recently fundamental physical constants have been introduced for the definition of all SI units and derived units. Electric potential differences between points can be caused physically by electric charge build up or imbalance eg. These latter processes at microscopic level have the physical origins previously mentioned. A voltmeter can be used to measure the voltage or potential difference between two points in a system; often a common reference potential such as the ground of the system is used as one of the points.

One of the major difference between the EMF and voltage is that EMF is the energy supplied to the charge, whereas the voltage is the energy requires to move the unit charge from one point to another. The other differences between them are explained below in the comparison chart. Measure between any two points. Source Dynamo, electrochemical cell, transformer, solar cell, photodiodes etc. Electric and magnetic field. Voltage is defined as the energy requires to moves the unit charge from one point to another. It is measured in volts and represented by the symbol V. If the electric potential difference between two locations is 3 volts, then one coulomb of charge will gain 3 joules of potential energy when moved between those.

## What is the difference between potential difference and voltage?

Home What is Voltage or Potential Difference? Facebook Twitter. What is Voltage?

Recall that earlier we defined electric field to be a quantity independent of the test charge in a given system, which would nonetheless allow us to calculate the force that would result on an arbitrary test charge. The default assumption in the absence of other information is that the test charge is positive. We briefly defined a field for gravity, but gravity is always attractive, whereas the electric force can be either attractive or repulsive. Therefore, although potential energy is perfectly adequate in a gravitational system, it is convenient to define a quantity that allows us to calculate the work on a charge independent of the magnitude of the charge. To have a physical quantity that is independent of test charge, we define electric potential V or simply potential, since electric is understood to be the potential energy per unit charge:.

Electric Potential: The amount of electric potential energy at a point is called electric potential. Electric potential difference is known as voltage, which is equal to the work done per unit charge to move the charge between two points against static electric field. This is named in honour of Italian Physicist Alessandro Volta. Since joule is the unit of work and coulomb is the unit of charge; 1 volt of electric potential difference is equal to the 1 joule of work to be done to move a charge of 1 coulomb from one point to another in an electric circuit.

#### COMMENT 4

• What is commonly referred to as voltage, is transversal voltage that is a special case of voltage equal to the potential difference that is unique. Similarly, in electrical circuit analysis, branch voltages are unique and equal to difference of nodal voltages (nodal potentials). Tristan T. - 29.05.2021 at 21:54