Electrical Measuring Instruments
Physics ⇒ Electricity and Magnetism
Electrical Measuring Instruments starts at 9 and continues till grade 12.
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See sample questions for grade 12
A student uses a voltmeter with a resistance of 10 kΩ to measure the voltage across a 1 kΩ resistor. Will the reading be accurate? Explain.
Describe how you would use a multimeter to check if a wire is broken inside its insulation.
Describe the difference between analog and digital measuring instruments.
Explain the purpose of calibration in electrical measuring instruments.
A student uses a voltmeter with a resistance of 10 kΩ to measure the voltage across a 1 kΩ resistor. Will the reading be accurate? Explain.
A digital multimeter is set to measure resistance, but the probes are not connected to any component. The display shows 'OL' or a very high value. What does this indicate?
A laboratory technician needs to calibrate a voltmeter. Briefly describe the steps and precautions that should be taken during the calibration process.
A voltmeter of resistance 20 kΩ is used to measure the potential difference across a resistor in a circuit. If the internal resistance of the source is not negligible, explain how the voltmeter reading will be affected and why.
A moving iron instrument can be used to measure:
(1) Only DC
(2) Only AC
(3) Both AC and DC
(4) Neither AC nor DC
A wattmeter measures:
(1) Only active power
(2) Only apparent power
(3) Only reactive power
(4) Both active and reactive power
Which instrument is best suited for measuring very small currents?
(1) Voltmeter
(2) Galvanometer
(3) Wattmeter
(4) Ohmmeter
Which instrument is used to measure the energy consumed by an electrical appliance over time?
(1) Ammeter
(2) Energy meter
(3) Voltmeter
(4) Galvanometer
A galvanometer can be converted into an ammeter by connecting a ________ resistance in ________ with it.
A voltmeter is always connected in ________ with the component across which the potential difference is to be measured.
A voltmeter is said to be ideal if its resistance is ________.
The deflection in a moving coil galvanometer is proportional to the ________ passing through it.
True or False: A digital voltmeter can measure both AC and DC voltages.
True or False: A voltmeter should have a very high resistance.
True or False: An ideal ammeter has zero resistance.
True or False: The accuracy of an analog instrument is generally less than that of a digital instrument.
