question_answer

  Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of in series with a combination of two resistors ( each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the  resistor be the same as that across the parallel combination of resistors ? Give reasons.  The Plan Make a rough sketch of the circuit using the material given with proper connection, then solve it.

Answer:

                  The circuit is shown in figure (1) Effective resistance of combination of two resistors ( each) in parallel is  Since, the resistor of  and parallel combination of two  resistors are in series, same current will flow through these. Hence, the potential difference across  resistor is same as that across combination of two resistors.                        (1)