Umair Gaines
Electric potential, also known as electric field potential, voltage, or potential drop, is a fundamental concept in understanding how electrical circuits function. It refers to the amount of work required to move a unit charge between two points in a circuit, and it plays a crucial role in determining how electricity flows. Electric potential is measured in joules per coulomb, also known as volts, and it helps us understand the 'push' or level of power behind the flow of electricity in a circuit. This distinction between electric potential and electric current is important, as they represent different aspects of electrical behaviour.
| Characteristics | Values |
|---|---|
| Definition | Electric potential is the amount of work needed to move a unit charge from a reference point to a specific point in a static electric field. |
| Other names | Electric field potential, potential drop, electrostatic potential, voltage |
| Formula | The electric potential between two charges is given by: \(U_r = -\frac{kqQ}{r}\) |
| Unit | Electric potential is measured in joules per coulomb (J⋅C−1) or volts (V) |
| Zero point | The reference point is usually the Earth or a point at infinity, with electric potential at zero units. |
| Relation to force | The electric force F exerted by the field on a positive charge q is given by F = qE. |
| Relation to work | The work W done in moving a positive charge q through a distance d is given by W = F'd = -qEd. |
| Relation to energy | Electric potential energy is the total potential energy a unit charge would possess if located at any point in outer space. |
| Relation to current | Electric potential is different from electric current; it is the "push" of electricity through a circuit. |
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What You'll Learn
- Electric potential is the amount of work needed to move a unit charge from a reference point
- The reference point is usually Earth, but any point can be used
- Electric potential is measured in joules per coulomb, or volts
- Differences in potential are measured with a voltmeter
- Electric potential is the 'push' of electricity through a circuit
Electric potential is the amount of work needed to move a unit charge from a reference point
Electric potential is defined as the electric potential energy per unit of electric charge. In other words, it is the amount of work needed to move a unit charge from a reference point to a specific point in a static electric field. The reference point is usually the Earth, or a point at infinity, though any point can be chosen.
The electric potential at the reference point is defined as zero units. This is because the Earth is so large that the addition or removal of charge from it will not alter its electrical state. The electric potential at a specific point, then, is the work done in moving a unit charge from the reference point to that specific point.
In an electrical circuit, the electric potential between two points is defined as the amount of work done by an external agent in moving a unit charge from one point to another. This is also known as the electric potential difference, or voltage. Voltage is the common name for electric potential difference, and it is the energy per unit charge.
The unit of measurement for electric potential is joules per coulomb, or volts. This is a measure of the push of electricity through a circuit. It is important not to confuse electric potential with electric current, which is the movement of charges.
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The reference point is usually Earth, but any point can be used
Electric potential, also known as electric field potential, potential drop, or electrostatic potential, is defined as the electric potential energy per unit of electric charge. In other words, it is the amount of work required to move a unit charge from a reference point to a specific point in a static electric field. The reference point is usually the Earth, but any point beyond the influence of the electric field charge can be used.
The electric potential at the reference point is defined as zero units because the Earth is so large that the addition or removal of charge from it will not alter its electrical state. This is analogous to how sea level or the floor of a lecture hall can be used as an arbitrary zero point for gravitational potential energy.
The choice of the reference point as zero volts is arbitrary, and any point can be chosen as the reference. This is because electric potential is a relative value, representing the difference in potential energy between two points. The electric potential at a point is calculated by dividing the potential energy at that point by the quantity of charge.
The electric potential between two charges can be calculated using the equation Ur = - [kqqo]/r. The electric potential between two points in an electrical circuit is defined as the amount of work done by an external agent in moving a unit charge from one point to another. This work done is also referred to as the electric potential energy or voltage, measured in joules per coulomb (J/C) or volts (V).
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Electric potential is measured in joules per coulomb, or volts
Electric potential, also known as electric field potential, potential drop, or electrostatic potential, is defined as the electric potential energy per unit of electric charge. In other words, it is the amount of work needed to move a unit charge from a reference point to a specific point in a static electric field. The reference point is usually the Earth, but any point beyond the influence of the electric field charge can be used.
The electric potential difference between points A and B, VB - VA, is defined as the change in potential energy of a charge q moved from A to B, divided by the charge. This is also known as the potential difference or voltage, which is the common name for electric potential difference.
In an electrical circuit, the potential between two points is defined as the amount of work done by an external agent in moving a unit charge from one point to another. This is also known as the 'push' of electricity through a circuit.
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Differences in potential are measured with a voltmeter
Electric potential, or electric field potential, is defined as electric potential energy per unit of electric charge. It is the amount of work needed to move a unit charge from a reference point to a specific point in a static electric field. The reference point is usually the Earth, but any point beyond the influence of the electric field charge can be used.
The electric potential difference between points A and B, VB - VA, is defined as the change in potential energy of a charge q moved from A to B, divided by the charge. The unit of potential difference is joules per coulomb, also known as a volt (V). This is why the electric potential difference between two points in space is known as voltage.
Differences in electric potential are measured with a voltmeter. The voltmeter measures the potential difference in volts. The volt is named after Alessandro Volta. The voltmeter measures the quantity known as electrochemical potential or fermi level. The pure unadjusted electric potential, V, is sometimes called the Galvani potential, φ.
The voltmeter is connected between two different types of metal, and it measures the potential difference corrected for the different atomic environments. Voltage and energy are related but distinct. Voltage is the common name for electric potential difference. The change in potential energy for a battery is negative, as it loses energy.
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Electric potential is the 'push' of electricity through a circuit
Electric potential is the push of electricity through a circuit. It is defined as the electric potential energy per unit of electric charge. In other words, it is the amount of work needed to move a unit charge from a reference point to a specific point in a static electric field. The reference point is typically Earth, but any point beyond the influence of the electric field charge can be used.
Electric potential is measured in joules per coulomb, also known as volts. It is important to distinguish electric potential from electric current, as they are two different concepts. Electric current refers to the movement of charges, while electric potential refers to the difference in the charge's density between two points in the circuit.
The electric potential between two points in a circuit is defined as the amount of work done by an external agent in moving a unit charge from one point to another. This work is done against the electric field, and the potential energy of a charge increases when it moves against the electric field and decreases when it moves with the electric field.
The electric potential difference between two points is known as voltage, and it is the common name for electric potential difference. For example, a battery has two terminals, and its voltage is the potential difference between them. Voltage is not the same as energy, but it is the energy per unit charge.
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Frequently asked questions
Electric potential, also known as electric field potential, is the amount of work needed to move a unit charge from a reference point to a specific point against an electric field.
Electric potential is the level of power behind the flow of electricity, whereas electric current is the movement of charges.
The unit of electric potential is joules per coulomb, also known as volts.
Electric potential is calculated as the electric potential energy per unit charge.
The reference point for electric potential is typically the Earth or a point at infinity, where the electric potential is assumed to be zero.
