Question

§1:::: Why should we switch off the key in between taking the readings of ammeter and voltmeter during the experiment to measure the resistance in combination circuits?



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Answer 1

Answer:

Explanation:

. An ammeter is connected in series with the circuit so that all the current being measured flows through the ammeter. Therefore, ammeters need to have very small resistance in order not to alter the current in the circuit. Voltmeters are used to measure voltages. A voltmeter is connected in parallel at the two points between which the potential difference is to be measured. Therefore, a voltmeter needs to have a large resistance so that very little current is diverted through it.