Electrical Measurement
Electrical Measurement - Related Videos
14:16
A New Application of the Electrical Penetration Graph (EPG) for Acquiring and Measuring Electrical Signals in Phloem Sieve Elements
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Cited by 24 •
2015
Electrical Penetration Graph (EPG) is a well-established technique for studying the feeding behavior of stylet-bearing insects. Here we show a new application of EPG as a non-invasive tool for the acquisition of intracellular electrophysiology recordings of sieve elements (SEs), the cells that form the phloem vasculature in plants.
11:02
Detection of Exosomal Biomarker by Electric Field-induced Release and Measurement (EFIRM)
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Cited by 43 •
2015
Exosomes are microvesicular structures found within biofluids that potentially carry important disease discriminatory biomarkers. Here, a novel method is used to specifically extract exosomes and rapidly test the exosomal cargo for both RNA/protein targets following the disruption of exosomes using non-uniform electric cyclic square waves.
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...
03:11
Adult Zebrafish Electrophysiology: A Method to Measure the Extracellular Electrical Activity of Neurons In Vivo
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2023
The protocol describes the procedure to perform electrophysiology in adult zebrafish. This method can be used for measuring neural activity in vivo.
10:23
Electric Fields
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN An electric field is generated by a charged object (referred to as the source charge) in the space around it, and represents the ability to exert electric force on another charged object (referred to as the test charge). Represented by a vector at any given point in the space, the electric field is the electrical force per unit test charge placed at that point (the force...
FAQs
A voltmeter’s high input resistance reduces the amount of current it draws from the circuit, helping preserve the circuit’s original behavior. Connecting it in parallel exposes the instrument to the potential difference across the selected part. This arrangement lets the reading represent voltage while minimizing loading-related measurement error.
An ammeter is placed in series so the circuit current passes through the instrument rather than being sampled from a separate branch. That placement aligns the measured signal with the charge flow being evaluated and helps limit measurement error. Its role is therefore tied to circuit arrangement, not merely to reading a numerical scale.
Calibration provides the reference that turns an instrument’s sensed electrical signal into a meaningful quantitative reading. The instrument compares the signal with a calibrated scale or reference, allowing voltage, current, resistance, charge, or power to be expressed consistently. Without that comparison, the measurement would be harder to interpret quantitatively in physical analysis.
Measurements of voltage and current can be compared with the relationship predicted by Ohm’s law. Agreement supports the expected circuit behavior, whereas a mismatch can indicate that the component or circuit does not behave as assumed. This comparison helps characterize electrical response in physics experiments.
First identify the electrical quantity relevant to the question, then select an instrument that senses that quantity and connect it in the appropriate circuit arrangement. Use parallel placement for voltage and series placement for current. Finally, compare the sensed signal with the calibrated scale or reference and interpret it in relation to the physical system.
During troubleshooting, measured values provide evidence about how a circuit or component is behaving rather than relying only on expected operation. Comparing measured voltage, current, resistance, charge, or power with the intended physical relationship can reveal where behavior differs. This makes measurement a practical basis for evaluating circuit performance and identifying unexpected behavior.
In physics, electrical readings help validate relationships and characterize circuit components under investigation. The same information supports energy monitoring and the design of reliable electrical and electronic systems. Because measurements connect sensed signals with calibrated quantities, researchers and engineers can compare observed behavior with expectations and use the results to guide control or evaluation of physical systems.