Practical No. 05: Determination of equivalent resistance in series connection of resistors.

 Practical No. 05: Determination of equivalent resistance in series connection of resistors.

• The experimental value of the equivalent resistance in series (Rs) was found to be approximately equal to the sum of the individual resistances (R1 + R2).

• It is concluded that for a series combination, the current remains the same through all resistors, but the voltage is shared.
• It is recommended to use resistors whose values are sufficiently different to clearly observe the voltage division.

• Answer: The rheostat is used to vary the total current in the circuit. This allows us to obtain multiple sets of voltage and current readings for each resistor configuration, which improves the accuracy of the calculated resistance values.

• Answer:
  • Formula: Voltage (V) = Current (I) × Resistance (R)
  • Given Data:
    • Current (I) = 5 A
    • Resistance (R) = 10 Ω

  • Calculation:
    • V = 5 A × 10 Ω
    • V = 50 V

• Answer:
  • Formula for series: R_effective = R1 + R2 + R3
  • Given Data: R1 = 25 Ω, R2 = 50 Ω, R3 = 75 Ω
  • Calculation:
    • R_effective = 25 + 50 + 75
    • R_effective = 150 Ω

• Answer:
  • Explanation: From Ohm’s law, Current (I) = Voltage (V) / Resistance (R). If resistance (R) is constant and voltage is increased to 5V, the new current will also increase five times.

• Answer:
  • Formula: R_equivalent = R1 + R2 + R3
  • Given Data: R1 = 15 Ω, R2 = 10 Ω, R3 = 20 Ω
  • Calculation:
    • R_equivalent = 15 + 10 + 20
    • R_equivalent = 45 Ω