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Ohmic and Non Ohmic Resistors

Which of the ...

Question

Which of the following statement is not true, regarding the electrical set-up for the verification of Ohms law:

A

The voltmeter is connected in parallel with the known resistance

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B

The ammeter is connected in series circuit

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C

The rheostat can only increase the resistance in electric circuit

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D

The single key is used to switch on/off the electric circuit

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Solution

The correct option is C The rheostat can only increase the resistance in electric circuit
The component used to regulate current without changing the voltage source is called variable resistance or rheostat. In an electric circuit, rheostat is often used to change the resistance in the circuit by either increasing or decreasing the resistance. Thus statement in option C is not true.

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Similar questions

Q. Choose the appropriate set of apparatus for performing the experiment to determine the equivalent resistance of two resistors when connected in series:
(1) Voltmeter, Ammeter, Two resistors, Key, Battery
(2) Ammeter, Two resistors, Key, Connecting wires, Rheostat, Battery
(3) Key, Rheostat, Voltmeter, Two resistors, Battery, Connecting wires
(4) Battery, Ammeter, Connecting wires, Rheostat, Voltmeter, Two resistors, Key

Q. Arrange the following steps to verify the Ohm's law in proper sequence.
(a) Switch on the electric circuit.
(b) Move the position of the slider of the rheostat and note down the ammeter and voltmeter readings.
(c) Connect ammeter, key, battery, rheostat and resistor in series by using conducting wires.
(d) Note down the Ammeter and voltmeter reading.
(e) Connect a voltmeter across the resistor.
(f) Determine the ratio of voltmeter reading and ammeter reading in each case.
(g) Note that the ratio of voltmeter and ammeter reading are equal in each case.

Which of the following statements is not true, regarding the electrical set-up for verification of Ohm's law?

Q. Regarding the connections of ammeter and a voltmeter in an electric circuit, the true statment is

Q. In an electrical circuit containing a source of emf and a load resistance, the voltmeter is connected by mistake in series with the load across the source and ammeter is connected parallel to the load. Then which meter burns out ?

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