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 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?
A student wants to measure the voltage across a lamp. Which instrument should they use?
A voltmeter reads 12 V across a resistor. If the current through the resistor is 2 A, what is the resistance?
Describe one safety precaution to take when using an electrical measuring instrument.
Explain why a voltmeter must have a high resistance.
Explain why an ammeter is always connected in series with the circuit.
Name one difference between an ammeter and a voltmeter.
What does an ohmmeter measure?
What is the function of a pointer in an analog measuring instrument?
What is the function of a shunt in an ammeter?
What is the main difference between a digital and an analog multimeter?
What is the purpose of a fuse in an electrical circuit?
What is the reading on an ammeter if 0.25 coulombs of charge pass through it in 5 seconds?
Which instrument is used to measure the potential difference between two points in a circuit?
A circuit contains a resistor of 10 Ω and is connected to a 5 V battery. If an ammeter with an internal resistance of 0.2 Ω is used to measure the current, what is the reading on the ammeter? (Assume the ammeter is ideal except for its internal resistance.)
A student uses a digital multimeter to measure the resistance of a wire and gets a fluctuating reading. List two possible reasons for this observation.
A student wants to measure the resistance of a light bulb while it is glowing. Explain why the reading on the ohmmeter may not be accurate.
