measurement of current and voltage pdf

Measurement Of Current And Voltage Pdf

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20.4: Measuring current and voltage

In this section, we describe how one can build devices to measure current and voltage. We will limit our description to the design of simple analogue ammeters and voltmeters. As we will see in Chapter 21, it is straightforward to build a device that can measure very small amounts of current, by running the current through a coil in a magnetic field so that the coil can deflect a needle that indicates the amount of current.

In this section, we describe how one can use a galvanometer in order to build ammeters to measure large currents, and voltmeters. When using an ammeter or a voltmeter, you will notice that these usually have buttons or dials to choose the range of currents or voltages to be measured. All the dial does is change the value of the shunt or series resistor in order to maintain a given maximum current through the galvanometer. An ohmmeter, to measure resistance, is simply an ammeter with a built-in fixed potential difference so that by measuring current across a known potential difference, the resistance of the component can be determined.

What reading does the voltmeter show? In this example, we saw that by using a voltmeter to measure a voltage in a circuit, we actually disturb the circuit. By placing the voltmeter in parallel with one resistor, we created an effective resistor with a resistance that is lower than the resistance of either the voltmeter or the resistor. This lowered the total resistance of the circuit, which increased the current. In general, when using a voltmeter, one needs a voltmeter with a very high resistance in order to minimize the disturbance to the circuit if the voltmeter has a high resistance, only a small amount of current will be shunted from the resistor.

Discussion: In this example, we saw that by using a voltmeter to measure a voltage in a circuit, we actually disturb the circuit.

Current, Voltage and Power Measurement

Premium Membership. Learn from experienced power engineers. Digital multimeter has generally replaced the analog-type multimeter as the test device of choice for maintainers because they are easier to read, are often more compact and have greater accuracy. Some offer frequency and temperature measurement. Figure 1 illustrates a typical autoranging digital multimeter. Of course for the meter to be of any use it must first be connected to the circuit or device to be tested. Both leads, one red and the other black , must be inserted into the correct meter lead jacks.

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With the meter set up as indicated, what is the value of current being measured? (​30 pa). DC Current Measurements ( pa).


Measuring Current, Voltage and Power, Volume 7

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An electric circuit is formed when a conductive path is created to allow electric charge to continuously move. Voltage is a specific measure of potential energy that is always relative between two points. When we speak of a certain amount of voltage being present in a circuit, we are referring to the measurement of how much potential energy exists to move charge carriers from one particular point in that circuit to another particular point. Current tends to move through the conductors with some degree of friction, or opposition to motion.

In this section, we describe how one can build devices to measure current and voltage. We will limit our description to the design of simple analogue ammeters and voltmeters. As we will see in Chapter 21, it is straightforward to build a device that can measure very small amounts of current, by running the current through a coil in a magnetic field so that the coil can deflect a needle that indicates the amount of current. In this section, we describe how one can use a galvanometer in order to build ammeters to measure large currents, and voltmeters. When using an ammeter or a voltmeter, you will notice that these usually have buttons or dials to choose the range of currents or voltages to be measured.

20.4: Measuring current and voltage

Current Sensors. Measuring High Currents. Interference and Shielding. Components of Power. Special Applications.

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