Answer to Question #61976 in Electric Circuits for musbahuuuu

Question

1 The potentiometer wire plays equivalent role of which of these devices in a circuit?
rheostat
thermostat
galvanometer
ammeter
2 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
3 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
4 Which of the following is NOT true about a rheostat?
It is a constant current instrument
It is a resistor with moving contact
It is used for varying the current in a circuit
It is used for varying the resistance in a circuit