Internal Voltage
Internal Voltage - Related Videos
05:52
Measuring the Induced Membrane Voltage with Di-8-ANEPPS
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Cited by 48 •
2009
External electric field induces a voltage on the membrane of a cell, termed the induced membrane voltage (ΔΦ). By using the potentiometric dye di-8-ANEPPS, it is possible to measure the ΔΦ noninvasively. This video shows the protocol for measuring ΔΦ using di-8-ANEPPS.
01:13
Voltage
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2024
The movement of electrons in a conductor requires some form of energy or work, usually provided by an external force, like a battery. This force is called the electromotive force or voltage. The voltage between two points, referred to as points "a" and "b," in an electric circuit is the energy (or work) needed to move a unit charge from point "a" to point "b," and this relationship is expressed mathematically as In this equation, "w" represents the energy measured in joules (J), and "q"...
09:18
Internal Standards
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2023
Source: Laboratory of Dr. B. Jill Venton - University of Virginia The goal of many chemical analyses is a quantitative analysis, where the amount of a substance in a sample is determined. In order to accurately calculate the concentration of an unknown from a sample, careful sample preparation is key. Every time a sample is handled or transferred, some of the sample can be lost. There are strategies however, for minimizing sample loss. There are also strategies for coping with sample loss and...
02:00
Internal Energy
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2020
The total of all possible kinds of energy present in a substance is called the internal energy (U), sometimes symbolized as E. Suppose a system with initial internal energy, Uinitial, undergoes a change in energy (transfer of work or heat), and the final internal energy of the system is Ufinal. Change in internal energy equals the difference between Ufinal and Uinitial. Although the values for Ufinal and Uinitial cannot be determined for a system, the first law of thermodynamics only...
01:25
Multiple Voltage Sources
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2023
Generally, a single battery is not enough to power some devices. In such cases, batteries can be combined in two ways: in series or in parallel. In series, the positive terminal of one battery is connected to the negative terminal of another battery. Hence, the voltage of each battery is added to give the net voltage, which is increased because each battery boosts the electrons that enter it. The same current flows through each battery because they are connected in series. Batteries are...
FAQs
A terminal measurement reports the potential difference available at selected connection points, whereas internal voltage describes electrical conditions within the device or circuit. Charge distributions and electric fields can vary throughout the structure, so the external reading may not reveal internal behavior. Examining both perspectives helps engineers interpret device operation and locate internal losses or abnormal conditions.
Charge separation produces electric fields that establish potential differences within a system. Other sources include electrochemical gradients in batteries, semiconductor junctions, and electrical effects induced by changing conditions. These mechanisms redistribute charge rather than simply applying voltage at a terminal. Identifying the source is important because it determines how the device responds and how engineers should model its behavior.
A semiconductor junction can redistribute charge and create an internal potential that influences current control. This voltage helps explain how semiconductor components respond to applied conditions rather than behaving like passive conductors. In engineering analysis, considering the junction’s internal electrical state supports more accurate predictions of component behavior and clarifies how electronic devices regulate or alter current.
In a battery, an electrochemical gradient provides a source of internal voltage through the redistribution of charge associated with the device’s chemical and electrical structure. The resulting internal condition contributes to power generation, while internal losses can reduce the useful behavior observed externally. Engineers examine this relationship when evaluating battery operation, performance, and possible failure modes.
Engineers use measurement and modeling together to infer internal electrical conditions. Measurements at available points provide evidence about device behavior, while models represent charge separation, electric fields, electrochemical gradients, junction effects, or induced electrical responses inside the system. Comparing predicted and observed behavior can reveal internal losses, support fault analysis, and improve confidence in design decisions.
Internal-voltage analysis helps engineers predict device behavior under applied conditions and identify losses or failure modes that may not be obvious from external measurements alone. It also supports improvements in circuit stability and safety. Applications include evaluating batteries, semiconductor components, sensors, and other electrical or electronic systems whose performance depends on charge redistribution inside the device.