Principles of voltage, current and resistance measurement – Notes – 1 – 1

Electrical Engineering » Notes » Principles of voltage, current and resistance measurement

1. Analog meters use a graduated scale with a pointer.

2. Digital meters provide a direct readout.

3. On both analog and digital meters, the red terminal is positive and the black terminal is negative.

4. Before using an analog meter, check the mechanical zero adjustment.

5. A multimeter combines a voltmeter, ammeter, and ohmmeter into one package.

6. A VOM is an analog multimeter that measures volts, ohms, and milliamperes.

7. A DMM is a digital multimeter.

8. On a multimeter, the range selector switch selects the function to be used.

9. An ammeter must be connected in series with a circuit.

10. A voltmeter is connected in parallel with a circuit.

11.  An ohmmeter measures resistance by the amount of current flowing through the resistor being measured.

12. The maximum value of a meter scale is called the full scale value.

13. The number of divisions on the meter scale depends on the range the meter is designed to measure.

14. Ammeters and voltmeters are read from left to right and have a linear scale.

15. Ohmmeters are read from right to left and have nonlinear scales.

16. An analog ohmmeter must be calibrated before use to compensate for battery deterioration.

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