n instrument which can measure potential without drawing any current is_____________________?
Correct answer: C. cathode ray oscilloscope (CRO)
- A. AA. voltmeter
- B. galvanometer
- C. cathode ray oscilloscope (CRO)
- D. ammeter
Explanation
A CRO has a very high input resistance, so it can measure potential difference while drawing an almost negligible current from the circuit. Students often choose a, a voltmeter, because voltmeters are also connected across two points, but a real voltmeter draws a small current whereas the CRO is designed for extremely high input impedance.
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