Measuring Voltage And Current In A Dc Circuit Pdf

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measuring voltage and current in a dc circuit pdf

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Voltmeter Impact on Measured Circuit

Electrical Engineering pp Cite as. This chapter focuses on the most basic measurement methods for electrical quantities using electrical measuring instruments. Unable to display preview. Download preview PDF. Skip to main content. This service is more advanced with JavaScript available.

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This Application Note compiles solutions to current sensing problems and organizes the solutions by general application type. These circuits have been culled from a variety of Linear Technology documents. Each chapter collects together applications that tend to solve a similar general problem, such as high side current sensing, or negative supply sensing. The chapters are titled accordingly. In this way, the reader has access to many possible solutions to a particular problem in one place. It is unlikely that any particular circuit shown will exactly meet the requirements for a specific design, but the suggestion of many circuit techniques and devices should prove useful.

Because measuring current in this manner requires the meter be made part of the circuit, it is a more difficult type of measurement to make than either voltage or resistance. Some digital meters, like the unit shown in the illustration, have a separate jack to insert the red test lead plug when measuring current. Other meters, like most inexpensive analog meters, use the same jacks for measuring voltage, resistance, and current. When an ammeter is placed in series with a circuit, it ideally drops no voltage as current goes through it. In other words, it acts very much like a piece of wire, with very little resistance from one test probe to the other.


When voltage causes electrons to move, work is done. The instantaneous RATE at which this work is done is called the electric power rate, and is measured in.


How to Use an Ammeter to Measure Current

Every meter impacts the circuit it is measuring to some extent, just as any tire-pressure gauge changes the measured tire pressure slightly as some air is let out to operate the gauge. While some impact is inevitable, it can be minimized through good meter design. Since voltmeters are always connected in parallel with the component or components under test, any current through the voltmeter will contribute to the overall current in the tested circuit, potentially affecting the voltage being measured.

Direct current DC is the one directional flow of electric charge. An electrochemical cell is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through semiconductors , insulators , or even through a vacuum as in electron or ion beams. The electric current flows in a constant direction, distinguishing it from alternating current AC.

Direct current

A DC circuit is an electrical circuit that consists of any combination of constant voltage sources, constant current sources and resistors.

Voltmeter Impact on Measured Circuit

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High dc voltages are usually measured by connecting a very high resistance Pre-discharges currents with in the test circuits cause very short duration voltage​.


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#1: DC Measurements

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2 Comments

  1. Gaspar A. 17.04.2021 at 01:49

    become familiar with using a multimeter to measure voltages, currents, and resistances. In the following lab you will make similar measurements for an AC circuit.

  2. Chelsea S. 17.04.2021 at 17:36

    To get acquainted with the methods of DC voltage and current measurements and Print (or redraw) appendix 2 from the manual, including tables Sketch a voltage divider circuit with a voltmeter with a finite internal resistance RV (read.