Answer to Question #61532 in Physics for na

Question

19 The advantage of potentiometer over voltmetr in measurements of emf is that
the potentiometer wire is assumed to be uniform
it does not draw current from the circuit under test
the temperatue of the wire must remain constant
faults may arise due to breaks or wrong connections in the circuit
20 Which of these is not a useful precaution in an electrical experiment?
key should be removed between readings to avoid battery run-down
jockeys should be dragged on resistance wires
the connections in the circuit should be tight
readings should be recorded as soon as they are obtained
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Answer 1

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