While understanding the meaning of physical quantities is important, it is also

Question

While understanding the meaning of physical quantities is important, it is also important to recognize how they are actually measured in practice.Consider the a source of voltage (or emf source), a resistor, an ideal voltmeter and an ideal ammeter following cirout diagram that includes 2 3 If you want to measure the current through and the voltage across the resistor, then the circles marked 1, 2 and 3, shown in the diagram, must represent, respectively Select all correct answers from the choices provided View Available Hints) 1-ammeter, 2-esistor, 3wottmeter 1-am meter, 2 voltmeter, 3sresistor 1-resistor, 2evoltmeter, 3.ammeter 1-resistor, 2namneter, 3 voltmeter 1"voltmeter, 2tresistor, 3am meter 1svoltmeter, 2amneter, 3resistor None of these combinations is appropriate

Explanation / Answer

1

Since ammeter has low resistance so it is used in series(as current remain same in series) with resistor to measure current so 1 and 2 must be resistor and ammeter(any one could be anything).

But voltage remain same in parallel connection so Voltmeter is used in parallel.

So 3 is Voltmeter.

So 1st and 4th option are correct.

2

Power = VI

or V2/R (since I = V/R)

or I2R (Since V = IR)

so 1, 6 , 7 are correct.

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