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1. OHMIC CONDUCTOR
A conductor which obeys Ohm’ Law is called an ohmic conductor. Do the potential difference and the current vary according to Ohm’s Law for conductors such as a constantan wire and a bulb?
Ohmic Conductor Experiment
Inference: The potential difference across the conductor depends on the current flowing through it.
Hypothesis: The higher the current, the higher the potential difference across the conductor.
Aim: To study the relationship between the current and the potential difference of an ohmic conductor.
A: Ohmic conductor (a constantan wire)
Variables:
(a) Manipulated: Current, II
(b) Responding: Potential different, V
(c) Constant: Temperature, diameter and length of constant wire.
Apparatus: 6.0 V dry cell, switch, connecting wire, ammeter (0-1 A), voltmeter (multimeter), rheostat, constantan wire s.w.g 24.
Please answer:
1. Record the voltmeter readings in Table 1.1.
2. Plot the graph of V against I from the table. Use the graph paper provided.
3. State your own conclusion from the graphs.
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TABLE 1.1 (Ohmic Conductor)
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Data analysis: Plot graph of potential difference, V against current, I for experiment A
Conclusion: What conclusion can be drawn from the experiment?
Prepare a complete report of experiment A and experiment B.
Discussion: Based on the graph of V against I, compare the shape and gradients of the graph.
Rujukan:
Form 5 Physics Textbook KSSM
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