Question

How will you conclude that the same potential difference (voltage) exists across three resistors connected in a parallel arrangement to a battery?

Answer 1

• Suppose 3 resistances are R₁, R₂ and R_3. We will connect these resistances in parallel with an ammeter (A), a voltmeter (V), a plug key (K)and a battery of known voltage as shown in figure given below.

• We will close the key K and record the ammeter and voltmeter readings.

• Now we will open the key and switch the position of voltmeter and ammeter as show in the figure given below.

• We will close the switch and note the readings. Similarly, we will switch the position of voltmeter to resistances R₂ and R₃ and observe the readings. 

• We will find that readings of ammeter keeps on changing but readings of voltmeter in all cases almost remain same in all cases.