To test the ohmic and non-ohmic behavior in a resistor and a bulb

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Shiba Younus

To test the ohmic and non-ohmic behavior in a resistor and a bulb

Ohm’s Law: When the temperature of a metallic conductor is kept constant, the current through the conductor is proportional to the potential difference across it; I α V. This statement is known as Ohm’s law. Materials obeying Ohm’s law thus have a constant resistance at constant temperature. A graph of I (current) versus V (voltage) gives a straight line through the origin if the material obeys Ohm’s law. Most materials obey Ohm’s law at low temperatures, but as temperature increases deviations from this law are seen.

Experiment 1: Aim: To test a bulb for ohmic or non-ohmic behavior.

Hypothesis: It is presumed that the light bulb will obey Ohm’s law as long as the current through it is small. As the current is increased, the temperature of the bulb increases and so does the resistance.

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Material:

  • Bulb (6V, 0.05A)
  • Power supply
  • Voltmeter
  • Ammeter
  • Wires
  • Clamps

Variables:

Dependant variables: current

Independent variables: voltage

Controlled variables: Bulb, ammeter, voltmeter, power supply, wires.

Method:

  1. A wire was connected from power supply to the (mA) outlet of ammeter.
  2. A second wire was connected from the (com) outlet of ammeter to the bulb.
  3. A third wire was connected from power supply to bulb.
  4. Two wires connected from bulb to voltmeter in parallel. One wire to the (v) outlet of the voltmeter and one to the (com) outlet.
  5. The power supply was then turned on ...

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