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Figure 10.5.2 10.5. 2: (a) When an ammeter is used to measure the current through two resistors connected in series to a battery, a single ammeter is placed in series with the two resistors because the current is the same through the two resistors in series. (b) When two resistors are connected in parallel with a battery, three meters, or three ...
- Measuring Resistance
- Measuring Voltage
- Measuring Current
Figure 2 shows the steps that should be followed when measuring resistance. Remember that resistance measurements are carried out without the power being applied to the component under test, and resistance values can varyby as much as 20% due to the tolerance of certain resistors. If a resistor does open, the digital multimeter display will flash o...
Figure 3 shows the steps that should be followed when measuring voltage. The measurement of both voltage and resistance is where the digital multimeter finds its greatest utilization. For voltage and resistance measurement, the red lead is inserted into the V – Ω (volt or ohm) meter jack. 1. Select volts AC (V~), volts DC (V—), mvolts (V—) as desi...
Figure 4 shows the steps that should be followed when measuring current. The measurement of current is rarely performed when troubleshooting, as the circuit path has to be opened to insert the digital multimeter in series with the current flow. However, if current is to be measured, the red lead is inserted into one of the ampere jacks, 10 amp (10A...
Jun 13, 2022 · 1. Turn the dial on the multimeter to read a DC voltage. Look for 20V and turn the knob to select. If you used this setting to try and measure a 40V project the multimeter would run out of range ...
- Jo Hinchliffe
- DC Voltmeters and Ammeters. Whereas voltmeters measure voltage, ammeters measure current. Some of the meters in automobile dashboards, digital cameras, cell phones, and tuner-amplifiers are actually voltmeters or ammeters (Figure 10.34).
- Measuring Current with an Ammeter. To measure the current through a device or component, the ammeter is placed in series with the device or component. A series connection is used because objects in series have the same current passing through them.
- Measuring Voltage with a Voltmeter. A voltmeter is connected in parallel with whatever device it is measuring. A parallel connection is used because objects in parallel experience the same potential difference.
- Analog and Digital Meters. You may encounter two types of meters in the physics lab: analog and digital. The term ‘analog’ refers to signals or information represented by a continuously variable physical quantity, such as voltage or current.
Dec 15, 2022 · How to measure resistance using a multimeter. More often than not, technicians find resistors with faded colors, making it challenging to determine the resistance value using the color-coding approach. In such a scenario, a multimeter can be used to measure the resistance value of the resistor. Figure 3: A digital multimeter.
The resistivity of a material is a measure of how strongly a material opposes the flow of electrical current. The symbol for resistivity is the lowercase Greek letter rho, ρ, and resistivity is the reciprocal of electrical conductivity: ρ = 1 σ. The unit of resistivity in SI units is the ohm-meter (Ω ⋅ m.
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Figure 6.4.2 (a) When an ammeter is used to measure the current through two resistors connected in series to a battery, a single ammeter is placed in series with the two resistors because the current is the same through the two resistors in series. (b) When two resistors are connected in parallel with a battery, three meters, or three separate ...
