Molly Ayala
Electric potential, also known as electric field potential, measures the amount of electric potential energy per unit of electric charge. In other words, it is the amount of work required to move a test charge from a reference point to a specific point in a static electric field. Electric potential is measured in volts (V), with the electric potential difference between two points in space known as voltage. Voltage provides insight into the pushing force of an electric field. In a circuit, the positive terminal is at a higher voltage than the negative terminal, and the electric potential energy depends on the type (positive or negative) and amount of charge, as well as its position in the field.
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What You'll Learn
Electric potential and voltage
The electric potential at a particular point in a circuit is influenced by the presence of charges. For example, the electric potential due to a point charge is inversely proportional to the distance from the charge. As you move farther from the charge, the electric potential decreases. Similarly, the electric potential along a line of charge is proportional to the natural logarithm of the radial distance from the line.
Voltage, on the other hand, is the difference in electric potential between two points in a circuit. It is often referred to as the potential difference. In electric circuits, the voltage is the potential difference between two points and is measured in volts. The voltage between two points represents the work done per unit charge by an external force to move a unit charge from one point to another against the electric force.
The relationship between electric potential and voltage can be understood through the equation PE = Vq, where PE represents the potential energy in joules, V is the potential in volts, and q is the value of the charge in coulombs. This equation demonstrates that electric potential is the potential energy per unit charge. Voltage, therefore, represents the difference in potential energy per unit charge between two points.
In summary, electric potential refers to the electric potential energy per unit charge at a specific point in a circuit, while voltage represents the difference in electric potential between two points. Both concepts are crucial in understanding and analysing electric circuits and have practical applications in various devices.
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Electric potential energy
Electric potential, often referred to as voltage, is a crucial concept in understanding how electric circuits work. It is the difference in potential from one point in a circuit to another. Voltage is the common name for electric potential difference, and it represents the potential difference between two points.
In a battery, the positive terminal is at a higher voltage than the negative terminal. This is because the positive terminal is the terminal with high potential, meaning a unit charge at this point contains high electric potential energy. The negative terminal has an excess of negative charge, which is repelled, resulting in a negative potential at all points.
The energy supplied by a battery is calculated, but not all of it is available for external use as some energy is used internally, resulting in a drop in terminal voltage. This is evident when a car battery is discharged, and the headlights dim due to a decrease in voltage.
The electric potential is closely related to the work done by the electric field. The work done by the electric field is equivalent to the electrical energy per unit charge required to drive a unit charge through a closed circuit. This is provided by the electromotive force (e.m.f.) of the battery.
It is important to distinguish between potential difference and electrical potential energy. Voltage or potential difference is the energy per unit charge, whereas electrical potential energy is dependent on the position of the charged particle in the electric field, similar to how gravitational potential energy depends on the distance from the Earth's surface.
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Electric potential difference
In simpler terms, electric potential difference is the energy per unit charge. For example, a motorcycle battery and a car battery can have the same voltage but differ in the amount of energy they can deliver. This is because voltage represents the potential energy per unit charge, so the battery with a higher voltage can move more charge.
In electric circuits, the potential difference between two points is the voltage. The potential difference between two points, A and B, can be calculated using the formula: V_B - V_A, where V represents the potential in volts. The potential at point B with respect to point A is equal to the work done by the electric force when a unit charge moves from A to B.
It is important to distinguish between potential difference and electrical potential energy. While related, they are not the same. Voltage, or potential difference, is the potential energy per unit charge. As a battery discharges, its terminal voltage drops, but the energy supplied by the battery remains the same. However, not all of the energy is available for external use.
The concept of electric potential difference is crucial in understanding how electric circuits function. It allows us to calculate the work done on a charge, independent of the magnitude of the charge. By defining electric potential, we can determine the potential energy per unit charge, which is independent of the charge itself. This helps us analyse the work done by an external force to move a unit charge against the electric force.
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Electromotive force
The term "electromotive force" was introduced by Alessandro Volta in 1801 to describe the active agent of a battery (which he had invented around 1798). In English, this term is known as "electromotive force". Electromotive force (emf) is the energy transfer to an electric circuit per unit of electric charge, measured in volts. Devices called electrical transducers provide an emf by converting other forms of energy into electrical energy.
The unit for electromotive force is the volt, which is numerically expressed as the number of joules of energy given by the source divided by each coulomb to enable a unit electric charge to move across the circuit. In the international metric system, emf is abbreviated as E, but it is also commonly abbreviated as emf. Despite its name, electromotive force is not a physical force.
In electromagnetism, an emf is induced in a coil or conductor whenever there is a change in the flux linkages. There are two types of emf: statically induced and dynamically induced. Statically induced emf occurs when the conductor is moved in a stationary magnetic field to change the flux linkage, while dynamically induced emf occurs when the change in flux linkage arises from a change in the magnetic field around a stationary conductor. The electromotive force generated by motion is often referred to as motional emf, while the electromotive force generated by a time-varying magnetic field is known as transformer emf.
The "seat of the electromotive force" was determined by Walther Nernst in 1889 to be primarily at the interfaces between the electrodes and the electrolyte. Chemical reactions at these interfaces drive the current in a voltaic cell. Electromotive force is produced by both primary (single-use) and secondary (rechargeable) cells, and it is usually of the order of a few volts.
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Electric field
Electric potential refers to the energy associated with electrical interactions. In circuits, the difference in electric potential from one point to another is called voltage. Voltage is the energy per unit charge, and it is the force that drives a unit charge through a closed circuit.
The electric potential between two points in a circuit is influenced by the presence of an electric field. An electric field exerts a force on charged particles, which can cause them to move. This work done on the charged particles is expressed in terms of electric potential energy, which is dependent on the position of the charged particle in the electric field.
In a simple circuit with a battery and a resistor, the battery acts as a charge source and the resistor as a charge sink. The battery provides an electromotive force (emf), which is the electrical energy per unit charge that drives the unit charge through the circuit. The positive terminal of the battery is at a higher electric potential than the negative terminal, as it has a higher voltage and electric potential energy.
As charges move through the circuit, they can encounter an electric field that influences their movement. For example, in a wire, there is initially an electric field that gets the current going by doing work on the electrons. However, once the current is established, there is no longer a need for an electric field to maintain the motion of the electrons, as they move at a constant speed.
The electric potential in a circuit can also be affected by the presence of resistance. At the resistor, charges experience a force and a loss of potential energy as they move to the other side. This loss of potential energy is due to the work done by the electric field at the resistor, which opposes the motion of the charges.
In summary, the electric potential in a circuit is influenced by the presence of electric fields, which can exert forces and do work on charged particles. The electric potential energy of a charged particle is dependent on its position in the electric field, with higher electric potential energy at points of higher voltage. The electric field can influence the movement of charges, and the presence of resistance can lead to a loss of electric potential energy.
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Frequently asked questions
Electric potential is the energy associated with electrical interactions. Every time an electronic device is used, electrical energy is being used.
The difference in electric potential from one point to another is called voltage. Voltage is the common name for electric potential difference.
A battery has two terminals, and its voltage is the potential difference between them. The positive terminal is at a higher voltage than the negative terminal.
Electric potential in a circuit refers to the electrical energy per unit charge required to drive a unit charge through a closed circuit. The positive terminal of a battery has a high electric potential energy.
