Answer to Question #51843 in Electric Circuits for Samuel

Question

10 The advantage of potentiometer over voltmeter in measurements of emf is that? athe potentiometer wire is assumed to be uniform b) it does not draw current from the circuit under test c) the temperature of the wire must remain constant d) 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? a) key should be removed between readings to avoid battery run-down b) jockeys should be dragged on resistance wires c) the connections in the circuit should be tight d) readings should be recorded as soon as they are obtained
12 Which of the following is not true about a rheostat? a) It is a constant current instrument b) It is a variable resistor with moving contact c) It is used for varying the current in a circuit d) It is used for varying the resistance in a circuit