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 9
A student connects an ammeter in parallel with a resistor. What is likely to happen?
A student wants to measure the voltage across a lamp. Which instrument should they use?
Describe one safety precaution to take when using an electrical measuring instrument.
Explain why a voltmeter must have a high resistance.
A circuit has a current of 3 A and a resistance of 4 Ω. What is the voltage across the circuit?
A circuit has a voltage of 24 V and a current of 4 A. What is the resistance?
A digital multimeter shows a reading of 0.5 A when measuring current. What is the value in milliamperes (mA)?
A student connects an ammeter in parallel with a resistor. What is likely to happen?
Which instrument can measure both AC and DC voltages? (1) Moving coil voltmeter (2) Moving iron voltmeter (3) Hot wire voltmeter (4) Both 2 and 3
Which instrument is used to measure alternating current (AC) as well as direct current (DC)? (1) Moving coil ammeter (2) Moving iron ammeter (3) Hot wire ammeter (4) Both 2 and 3
Which instrument is used to measure electric current in a circuit? (1) Voltmeter (2) Ammeter (3) Ohmmeter (4) Galvanometer
Which instrument is used to measure the energy consumed over time by an electrical device? (1) Wattmeter (2) Energy meter (3) Ammeter (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 voltage is to be measured.
The resistance of an ideal ammeter is ________.
The resistance of an ideal voltmeter is ________.
A voltmeter has a resistance of 10,000 Ω. Is this considered high or low for a voltmeter?
If a voltmeter is connected in series in a circuit, will it give correct readings? Yes or No.
True or False: A galvanometer can be used to measure both current and voltage directly.
True or False: A moving coil galvanometer can be used to measure both AC and DC.
