Question

Draw a circuit diagram of an electric circuit containing a cell, a
key, an ammeter, a resistor of 2Ω in series with a combination of
two resistors 4Ω each in parallel and a voltmeter across the
parallel combination. Will p.d. across the 2Ω resistor be the same
as that across the parallel combination of 4Ω resistors? Give
Reason.

Answer 1

Answer:

Thus, resistance of parallel combination is equal to resistance of resistors in series. So, potential difference across 20 resistance will be same as potential difference across the

other two resistors which are connected in parallel.

Answer 2

Answer

The circuit is shown as the figure: Effective resistance of combination of two resistors (4 ohms each) in parallel is Reff=4×44+4=2ΩReff=4×44+4=2Ω The potential difference across the 2Ω resistor be the same as that across the parallel combination of 4Ω resistors because when resistors are connected in a parallel to each other, the potential difference across each other is equal to the potential difference across the parallel combination of resistors.