Question
How will you conclude that the same potential difference (voltage) exists across three resistors connected in a parallel arrangement to a battery?
✓
Answer
Perform an activity to investigate the relation between potential difference across parallel combination of resistors and the potential difference across each individual resistors,
- Connect three resistors of resistances $R _1, R _2$ and $R _3$ in parallel. One end of each resistor is joined at a common point ‘a’ and the other end of each resistor is connected at another common point ‘b’.
- Connect the parallel combination of resistors with a battery, a plug key K and an ammeter A as shown in figure.
- Now connect a voltmeter across the parallel combination of resistors between a and b points.
- Note the reading of voltmeter. Let it be V. This is the potential difference across the parallel combination of resistors.
- Now, disconnect the voltmeter and connect it across $R_1$ as shown in figure.
- Note the reading of voltmeter. It is found to be V.
- Disconnect the voltmeter and connect it across $R _2$. Note the reading of voltmeter. It is found to be V .
- Again disconnect the voltmeter and connect it across $R _3$. Note the reading of voltmeter. It is found to be V .
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