Explain the experiment procedure and list out the apparatus of the experiment of resistance increases with the length of the conductor and discuss precautions
Answers
Experiment:
Aim : To study the factors on which resistance of conducting wires depends. Apparatus Required : A cell, an ammeter, nichrome wires of different length but same area of cross-section (thickness), nichrome wires of same length but different thickness, copper and iron wire of the same length and same thickness as that of any nichrome wire.
Procedure :
Connect the cell, an ammeter and plug key in series with nichrome wire of length T (marked 1) in the gap XY as shown.
electricity-chapter-wise-important-questions-class-10-science-9
Close the key and note the reading of ammeter. It measures the current ‘I’1 through the nichrome wire (marked ‘1’).
Replace the marked 1 wire with another nichrome wire having same area of cross-section (thickness) but of double length’2l’ (marked 2).
Note the ammeter reading (I2) again after closing the key.
Again replace the marked 2 wire with marked 3 wire which has the same length but is thicker than marked 1 and 2 nichrome wires. Again note down the current (I3) through this wire.
Unplug the key. Remove marked 3 nichrome wire from the gap XY. Connect the copper wire marked 4 having same length and same area of cross-section as that of nichrome wire marked 1. .
Plug the key again and note the ammeter reading. It measures the current (I4) through copper wire.
Repeat the experiment with iron wire and measure the current (I5).
Observation :
Current ‘ I’ is half ofI1 i.e., I2 =1/2 I1
Current I3 increases when thicker wire of same length and of same material
i. e., nichrome is used.
Current I4 and I5 is different for copper and iron wire.
Conclusion :
Different wires drew different amount of current from the same cell.
First observation indicates that the resistance of the conductor increases with increase in length. So, resistance is directly proportional to length.
Second observation shows that thicker wires have lesser resistance. So, resistance is inversely proportional to area of cross section of the wire.
Third observation shows that resistance of the conductor depends on the nature of its material.
Answer:
It is abundantly obvious from the resistance and length formula that the resistance is inversely proportionate to its length. The resistance value of a material increases with an increase in length. The object's resistivity value will drop as its length does as well.
Explanation:
Aim: Explain the experimental process, identify the equipment used in the resistance increases with conductor length experiment, and talk about safety measures.
procedure:
As indicated, connect the cell, an ammeter, and a plug key in series with a length T of nichrome wire in the gap XY.
electricity-chapter-wise-important-questions-class-10-science-9
Lock the key and record the ammeter's reading. It gauges the nichrome wire's current, "I,"1.
Substitute another nichrome wire with the same area of cross-section (thickness) but double the length, or "2l," for the wire marked "1".
After you turn the key, take another look at the ammeter reading (I2).
Replace the marked 2 wire once more with the indicated 3 wire, which is thicker than the marked 1 and 2 nichrome wires but has the same length.
Record the current passing through this wire once more.
Record the voltmeter & ammeter measurements after turning the power supply on.
Turn off the power source, reposition the crocodile clip a few centimetres, and take new measurements.
The project requires the following hardware:
1 ammeter and 1 voltmeter
5 wires
2 crocodile clips
A Powerpack
Nichrome wire(100 cm)
The precautions should be observed while conducting this experiment are as follows:
Verify that each wire is correctly connected.
Make sure the wires' insulation is not deteriorating.
Ensure that a switch and an L.E.D. are used to isolate the power.
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