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 11
A student uses a voltmeter with a resistance of 10,000 Ω to measure the voltage across a resistor. If the resistor has a value of 100 Ω, will the voltmeter reading be accurate?
A voltmeter is connected across a resistor in a circuit. If the voltmeter has a low resistance, what effect does it have on the measurement?
A voltmeter is designed to measure up to 10 V. If you want to increase its range to 50 V, what should you do?
Describe the function of a shunt in an ammeter.
A moving coil galvanometer has a coil of 100 turns, area 2 cm², and is placed in a magnetic field of 0.2 T. If a current of 1 mA passes through it, what is the torque on the coil?
A student uses a voltmeter with a resistance of 10,000 Ω to measure the voltage across a resistor. If the resistor has a value of 100 Ω, will the voltmeter reading be accurate?
A voltmeter is connected across a resistor in a circuit. If the voltmeter has a low resistance, what effect does it have on the measurement?
If a galvanometer has a resistance of 50 Ω and gives full-scale deflection at 1 mA, what value of shunt resistance is needed to convert it into an ammeter of range 10 A?
Which instrument is used to measure both AC and DC currents?
(1) Moving coil galvanometer
(2) Moving iron instrument
(3) Hot wire instrument
(4) Both (2) and (3)
Which instrument is used to measure electrical power in a circuit?
(1) Ammeter
(2) Voltmeter
(3) Wattmeter
(4) Galvanometer
Which instrument is used to measure the resistance of an electrical component?
(1) Ammeter
(2) Voltmeter
(3) Ohmmeter
(4) Galvanometer
Which of the following instruments can be used to measure both voltage and current?
(1) Ammeter
(2) Voltmeter
(3) Multimeter
(4) Galvanometer
A voltmeter is always connected in ________ with the component across which the potential difference is to be measured.
A voltmeter should have a very ________ resistance to ensure accurate measurement of potential difference.
The device used to measure the potential difference between two points in a circuit is called a ________.
The sensitivity of a galvanometer is defined as the deflection per unit ________.
True or False: A digital multimeter can measure only DC quantities.
True or False: A galvanometer can be converted into an ammeter by connecting a low resistance (shunt) in parallel with it.
True or False: A potentiometer can be used to compare the emf of two cells accurately.
True or False: An ideal ammeter has zero resistance.
