Physics Class 10 Practical 28 Important Viva Questions with AnswersVerify Ohm’s law (using wire as conductor).

on

                             


Viva Questions and Answers

  1. What is Ohm's Law?

    • Ohm's Law states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points, provided the temperature remains constant. It is mathematically expressed as V=IR

  2. What is the purpose of this experiment?

    • The purpose is to verify Ohm’s Law by demonstrating that the ratio of voltage to current is constant for a given wire (conductor) and thereby determining the resistance of the wire.

  3. What apparatus is required for this experiment?

    • The apparatus includes a wire (conductor), a voltmeter, an ammeter, a power supply, a rheostat (variable resistor), and connecting wires.

  4. How do you set up the circuit for this experiment?

    • Connect the wire in series with the ammeter and rheostat. Connect the voltmeter in parallel across the wire. Connect the circuit to the power supply.

  5. Why is the ammeter connected in series and the voltmeter in parallel?

    • The ammeter is connected in series to measure the total current flowing through the circuit, while the voltmeter is connected in parallel to measure the voltage across the specific component (wire) accurately.

  6. What is the function of the rheostat in the circuit?

    • The rheostat is used to vary the resistance in the circuit, allowing for the adjustment of current and voltage.

  7. How do you conduct the experiment?

    • Adjust the rheostat to change the current flowing through the wire. Record the corresponding voltage and current readings from the voltmeter and ammeter. Repeat this for different values of current.

  8. How do you verify Ohm's Law from your observations?

    • Plot a graph of voltage (V) against current (I). If the plot is a straight line passing through the origin, Ohm's Law is verified, indicating that the resistance (R) is constant.

  9. What should the graph of V versus I look like according to Ohm's Law?

    • According to Ohm's Law, the graph of V versus I should be a straight line passing through the origin, indicating a linear relationship between voltage and current.

  10. What is resistance and how is it calculated in this experiment?

    • Resistance (R) is a measure of how much a material opposes the flow of electric current. It is calculated using the slope of the V versus I graph, or by using the formula R=VIR = \frac{V}{I} for each set of readings.

  11. What precautions should be taken during the experiment?

    • Ensure all connections are secure, start with the lowest voltage setting to avoid overheating the wire, take multiple readings for accuracy, and ensure the voltmeter and ammeter are properly calibrated.

  12. What might cause deviations from Ohm’s Law in this experiment?

    • Deviations can occur due to heating of the wire (changing resistance), poor connections, inaccurate readings, or a non-ohmic conductor.