Potential Difference
Potential Difference - Related Videos
01:16
Electric Potential and Potential Difference
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2023
Suppose a positive test charge moves away from a positive static charge, then the Coulomb force does positive work, and its electric potential energy decreases. The potential energy per unit charge is defined as the electric potential. The electric potential is independent of the test charge. When a test charge moves from the initial to the final position, the electric potential difference between those positions is defined as the ratio of the change in the potential energy to the charge on the...
09:47
Standardized Measurement of Nasal Membrane Transepithelial Potential Difference (NPD)
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Cited by 32 •
2018
Here, we present a standardized protocol to measure the nasal potential difference (NPD). Cystic fibrosis transmembrane conductance regulator (CFTR) and epithelial sodium channel (ENaC) function are evaluated by the change in the voltage across the nasal epithelium after superfusion of solutions that modify ion channel activity, providing an outcome measure.
07:30
Just-noticeable Differences
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University Psychophysics is a branch of psychology and neuroscience that tries to explain how physical quantities are translated into neural firing and mental representations of magnitude. One set of questions in this area pertains to just-noticeable differences (JND): How much does something need to change in order for the change to be perceivable? To pump intuitions about this, consider the fact that small children grow at an enormous...
08:55
Nasal Potential Difference to Quantify Trans-epithelial Ion Transport in Mice
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Cited by 2 •
2018
Here, we present a protocol to measure nasal potential difference in mice. The test quantifies the function of transmembrane ion transporters such as the cystic fibrosis transmembrane conductance regulator and the epithelial sodium channel. It is valuable to evaluate the efficacy of novel therapies for cystic fibrosis.
06:50
Electric Potential
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Electric potential, also known as "voltage", measures the electric potential energy per unit charge. Electric field is a scalar quantity and is fundamental to many electrical effects. Like potential energy, what is physically meaningful is the difference in the electric potential. For example, the spatial variation in the electric potential is related to the electric...
FAQs
A potential difference can drive charge through a conductor because a difference in electric potential creates an electric field. The field acts across the conductor and provides the condition for charge movement, while the voltage magnitude indicates the work done or energy transferred per unit charge. This principle connects voltage with observable circuit behavior.
These sources maintain potential difference by separating charge or converting other forms of energy. Batteries, generators, and power supplies therefore do more than provide a connection: they sustain the energy difference needed for charge movement through circuit components. Their operation explains how electrical circuits can continue functioning rather than quickly reaching an unchanged electrical state.
Potential difference describes the energy transferred per unit charge between two points, whereas current refers to charge moving through a conductor. Voltage provides the electrical condition that can drive this movement; current is the resulting flow through the circuit. Distinguishing these quantities helps explain why a circuit can have a voltage source that enables current through components.
Voltage magnitude expresses how much work is done or energy transferred for each unit of charge moving between two points. Comparing its magnitude helps describe the electrical conditions established by a source and experienced by circuit components. Because voltage is measured in volts, this quantity provides a standardized basis for analyzing circuits and power-related systems.
A voltmeter measures the potential difference between two points, so it is connected in parallel with the part of the circuit being examined. This placement allows the instrument to compare the electrical potential at both points. Applying the parallel connection correctly supports direct voltage measurements across circuit components without treating the meter as the main path of the circuit.
These sources are used when a circuit requires a maintained potential difference to enable charge flow through components. Batteries provide one familiar source, while generators and power supplies represent other ways to sustain the electrical condition. Their roles connect the study of voltage with circuit operation, power transmission, and the functioning of electronic devices.