Question

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

Answer 1

The circuit is shown in figure. Effective resistance of combination of two resistors (4 Ω each) in parallel is

Since the resistor of 2 Ω and parallel combination of two 4 Ω resistors are in series, same current will flow through these. Hence, the potential difference across 2 Ω resistor is same as that across combination of two resistors.