Q15 of 52 Page 382

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

• Suppose 3 resistances are R1, R2 and R3. 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.


More from this chapter

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13

Find the current drawn from the battery by network of four resistors shown in the figure?

 14

A wire is cut into three equal parts and then connected in parallel with the same source. How will its.

(i) resistance and resistivity gets affected?


(ii) How would the total current and the current through the parts change?

 16

What will be the length of a nichrome wire resistance 5.0Ω, if the length of similar wire of 120 cm has resistance of 2.5 Ω? Why?

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Disha was given two thin wires A and B in science laboratory. The teacher asked her to find out which wire was “fuse wire” and which one was “nichrome wire”. Disha was given batteries of 3 V and 12 V and some connecting wires. The teachers also advised her to switch off fan while performing the activities and take necessary precautions to avoid burns. Disha performed the activities for testing and concluded that wire A is nichrome wire, whereas wire B is fuse wire.

On the basis of above information, answer the following questions


(i) Describe the activity which Disha performed to conclude that wire A is nichrome wire.


(ii) Describe the activity which Disha performed to conclude that wire B is fuse wire.