Answer to Question #61522 in Physics for hi

Question

10 The advantage of potentiometer over voltmeter 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 temperature of the wire must remain constant
faults may arise due to breaks or wrong connections in the circuit
11 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
12 Which of the following is not true about a rheostat?
It is a constant current instrument
It is a variable resistor with moving contact
It is used for varying the current in a circuit
It is used for varying the resistance in a circuit

Answer 1

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