Analog Ammeter
Analog Ammeter - Related Videos
01:11
Ammeter
0 Views •
2023
An ammeter is a current measuring instrument. In the circuit, it is represented by the symbol A. The ammeter is placed in series with the device or component to measure the current. A series connection is used because objects in series have the same current passing through them. If a circuit has multiple resistors and the current needs to be measured in each resistor, the number of ammeters required depends on whether the circuit is in series or parallel. When an ammeter is used to measure the...
02:48
Labeling of Replicating HSV-1 Genomes with a Nucleoside Analog
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2026
Source: Dembowski, J. A., Deluca, N. A. Purification of Viral DNA for the Identification of Associated Viral and Cellular Proteins. J. Vis. Exp. (2017)This video demonstrates the infection of stationary-phase mammalian cells with HSV-1 (Herpes Simplex Virus-1), followed by replication of the viral genome using host and viral replication machinery. A synthetic nucleoside analog is incorporated into newly synthesized viral DNA to label replicating genomes, which are subsequently isolated for...
10:13
Fentanyl Analog Screening using LC-TIMS-TOF MS/MS
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A method for the screening of fentanyl analogs based on their retention time, mobility, and mass spectrometry fragmentation pattern.
06:58
Cell Cycle Analysis in the C. elegans Germline with the Thymidine Analog EdU
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2018
An imaging-based method is described that can be used to identify S-phase and analyze cell cycle dynamics in the C. elegans hermaphrodite germline using the thymidine analog EdU. This method requires no transgenes and is compatible with immunofluorescent staining.
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Fluorescence-based Monitoring of PAD4 Activity via a Pro-fluorescence Substrate Analog
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PAD4 is an enzyme responsible for the conversion of peptidyl-arginine to peptidyl-citrulline. Dysregulation of PAD4 has been implicated in a number of human diseases. A facile and high-throughput compatible fluorescence based PAD4 assay is described.
FAQs
In a moving-coil design, current through the instrument creates a magnetic interaction that produces torque on the coil or associated moving element. That torque shifts the pointer across the calibrated scale, so larger current produces greater deflection. The pointer therefore provides a visible, proportional indication of circuit current rather than merely presenting a numerical value.
A low-resistance path helps the instrument measure current while producing only a controlled voltage drop in the circuit. A shunt resistor can carry current through this path and support the intended measurement behavior. This design is important because the meter must provide a readable deflection without significantly changing the circuit conditions being investigated.
The pointer’s continuous movement can make short-term changes, fluctuations, and overall trends visually apparent. Instead of seeing only one displayed value, an observer can follow how the current changes during an experiment. This feature is especially useful when students are relating circuit behavior to changing conditions or checking whether a circuit remains stable.
Selecting an appropriate range helps protect both the instrument and the circuit during measurement. The chosen range must accommodate the expected current while allowing useful pointer movement on the calibrated scale. Proper selection supports a meaningful reading and reduces the risk associated with connecting an instrument that is not suited to the current being examined.
First place the instrument in series with the circuit so the circuit current passes through its low-resistance measurement path. Select a suitable range before observing the pointer on the calibrated scale. Then compare the deflection with the scale markings and watch for fluctuations or trends. This sequence helps verify circuit behavior while reducing measurement and connection errors.
It is useful when learners or researchers need to verify expected circuit behavior, observe changing current directly, or investigate possible faults. The physical pointer connects the measured quantity with visible motion, which can support conceptual understanding of current. In laboratory work, its continuous response also helps reveal behavior that a single digital reading might not make obvious.