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 10
A digital voltmeter displays a reading of 5.00 V. How many significant figures are in this measurement?
A galvanometer has a resistance of 50 Ω and shows full-scale deflection at 2 mA. What value of shunt resistance is needed to convert it into an ammeter of range 10 A?
A galvanometer shows full-scale deflection for a current of 1 mA. What is the maximum current it can measure without modification?
A voltmeter is connected across a lamp and reads 12 V. If the current through the lamp is 0.5 A, what is the resistance of the lamp?
Describe the function of a shunt in an ammeter.
Explain why a shunt is used in an ammeter but not in a voltmeter.
Explain why a voltmeter is always connected in parallel in a circuit.
Explain why an ammeter must have a very low resistance.
Name the device used to measure the potential difference between two points in an electric circuit.
Name the instrument that can measure current, voltage, and resistance.
State one advantage of a digital voltmeter over an analog voltmeter.
State one use of a potentiometer other than measuring emf.
State the main difference between an ammeter and a voltmeter.
The least count of an analog voltmeter is 0.1 V. What is the minimum voltage it can measure accurately?
