Voltage Transformation
Voltage Transformation - Related Videos
03:33
Preparation and Transformation of Bacteria Using High-Voltage Electroporation
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2025
Source: Stefan, A., et al., The Multifaceted Benefits of Protein Co-expression in Escherichia coli. J. Vis. Exp. (2015)This video demonstrates the procedure for transforming Escherichia coli with a plasmid carrying an antibiotic resistance gene, including cell preparation, electroporation, recovery, and selection of transformants.
10:50
Single Phase Transformers
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2023
Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT. Transformers are stationary electric machines that step up or down AC voltage. They are typically formed of primary and secondary coils or windings, where the voltage on the primary is stepped up or down at the secondary, or the other way around. When a voltage is applied to one of the windings and current flows in that winding, flux is induced in the magnetic core, coupling both windings. With an AC...
12:19
Bacterial Transformation: Electroporation
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2023
The term “transformation” refers cellular ingestion of foreign DNA. In nature, transformation can occur in certain types of bacteria. In molecular biology, however, transformation is artificially induced through the creation of pores in the bacterial cell walls. Bacterial cells that are able to take up DNA from the environment are called competent cells. Electrocompetent cells can be produced in the laboratory and transformation of these cells can be achieve via the application of an...
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.
04:33
Bacterial Transformation - Concepts
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2019
Background In early 20th century, pneumonia was accountable for a large portion of infectious disease deaths1. In order to develop an effective vaccine against pneumonia, Frederick Griffith set out to study two different strains of the Streptococcus pneumoniae: a non-virulent strain with a rough appearance (R-strain) and a virulent strain with a smooth appearance (S-strain) due to an outer polysaccharide capsule2. This outer layer of the S-strain bacteria enabled them to withstand the host...
FAQs
The relative numbers of turns in the primary and secondary coils determine the transformed voltage. A secondary coil with more turns produces a higher voltage, whereas one with fewer turns produces a lower voltage. This relationship lets engineers match the electrical potential difference to the requirements of transmission systems, distribution networks, or connected devices.
A changing current in the primary coil creates changing magnetic flux in the iron core. That changing flux links the secondary coil and induces a voltage in it through electromagnetic induction. Without this changing magnetic condition, the mechanism described for transformer operation would not provide the secondary voltage needed for transferring electrical energy between circuits.
A step-up transformer raises voltage before electrical power travels over long distances. For the transmission task described, the corresponding reduction in current helps limit resistive losses in the system. This makes voltage transformation important in power-grid design, because increasing voltage supports more efficient movement of electrical energy across extended transmission paths.
Step-up transformation increases voltage for applications such as long-distance transmission, where reduced current helps limit resistive losses. Step-down transformation decreases voltage for distribution and device operation, supporting safer delivery and compatibility with circuit requirements. The choice therefore depends on whether the system needs efficient transmission or a lower voltage for use.
A power system can use step-up transformation before long-distance transmission and step-down transformation nearer distribution or device operation. This arrangement matches voltage to changing system requirements while helping reduce resistive losses during transmission and supporting safer delivery at lower voltages. It provides a physics-based framework for analyzing how electrical energy moves through the grid.
Examining the primary and secondary coils, their turns ratio, and the changing magnetic flux helps explain how electrical energy is transferred between circuits. The analysis can connect voltage choice with transmission efficiency, distribution safety, and device requirements. In physics, these relationships support interpretation of power-grid behavior and the design of systems that use alternating current.