Practical No. 06: Determination of equivalent resistance in parallel connection of resistors.
XIII. Interpretation of Results
- The experimentally found equivalent resistance for the parallel combination (Rp) was less than the smallest individual resistance.
XIV. Conclusions and Recommendations
- It is concluded that for a parallel combination, the voltage remains the same across all resistors, but the current is divided.
- It is recommended to ensure all connections are tight to prevent any unintended resistance in the circuit.
XV. Practical Related Questions & Answers
Q1. Write the range of the ammeter used in experiment.
- Answer: The range of the ammeter used was 0 to 5 Amperes.
Q2. Find the equivalent resistance between point A & B.
- Answer:
- Step 1: For the parallel part (3 Ohms, 3 Ohms, 3 Ohms):
- 1/Rp = 1/3 + 1/3 + 1/3 = 3/3
- Therefore, Rp = 1 Ohm (Ω)
- Step 2: For the entire circuit in series with the 4 Ohms resistor:
- Rs = R1 + Rp = 4 + 1
- Rs = 5 Ohms (Ω)
- Step 1: For the parallel part (3 Ohms, 3 Ohms, 3 Ohms):
Q3. If two resistance 3Ω & 4Ω are connected in parallel, then what is the equivalent resistance in the circuit?
- Answer:
- Formula: 1/Rp = 1/R1 + 1/R2
- Given Data: R1 = 3 Ω, R2 = 4 Ω
- Calculation:
- 1/Rp = 1/3 + 1/4 = (4 + 3) / 12 = 7/12
- Rp = 12/7 Ω
- Rp ≈ 1.71 Ohms (Ω)
Q4. When the resistance are connected in parallel effective resistance increases or decreases?
- Answer: The effective (equivalent) resistance decreases.
Q5. State law of resistance in parallel.
- Answer: The law states that the reciprocal of the equivalent resistance of a parallel combination is equal to the sum of the reciprocals of the individual resistances.
- Formula: 1/Rp = 1/R1 + 1/R2 + 1/R3 + …
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