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| Effect of Temperature on Resistance |
EFFECT OF TEMPERATURE ON RESISTANCE
AIM :-
You are given a Wheatstone bridge, a container filled
with a liquid, a resistor made from an iron wire etc. Immerse the resistor in
liquid and connect it in an appropriate arm of Wheatstone bridge. Measure the
resistance at different temperatures. Draw the graph of resistance versus
temperature and from it find the resistance at 200 c and 1000c.
Use the following formula to determine(a
), the temperature coefficient of resistance.
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| Formula to calculate Effect of temperature on Resistance |
PRINCIPLE :- On
increasing the temperature of a conductor its resistance increases.
APPARATUS :- A coil of iron wire, container filled with
liquid, a battery (2 V), a rheostat, a sensitive galvanometer, a simple key, a
thermometer, a calorimeter, a burner, wire gauge, resistance box.
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| Apparatus for Effect of Temperature on Resistance |
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| Practical Effect of Temperature on Resistance |
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| Procedure of Effect of Temperature on Resistance |
PRECAUTION :-
(1) Keep
the iron cylinder completely immersed in liquid.
(2) Keep
all connections tight.
(3) Stir
the calorimeter for uniform heating of water. Note the temperature of the
liquid immediately after the null point is obtained at every observations.
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| Graph of Effect of Temperature on Resistance |
Draw the graph of Rt
® t. it is a linear graph. Extend this straight
line on both the sides. Find R20 and R100 at
the temperatures 20 0C and 100 0C respectively.
R20 = …………… W at temperature 20 0C
R100 = …………… W at temperature 100 0C
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The
temperature co-efficient of resistance of the given iron-wire is
RESULT :- Temperature
coefficient of resistance at given iron wire a = ………( 0c) -1
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