question_answer 67)

  A current of 1 A flows in a series circuit containing an electric lamp and a conductor of  when connected to a 10V battery. Calculate the resistance of the electric lamp. Now, if a resistance of is connected in parallel with this series combination, what change (if any) in current flowing through conductor and potential difference across the lamp will take place? Give reason.

Answer:

                  Given current, Resistance of conductor, Voltage, V = 10 V Total resistance in the circuit, Resistance of lamp,             Potential difference across the lamp                 When  resistance is connected in parallel with total resistance, thentotal resistance R' in the circuit is given by Current through the circuit, Since, ad are in parallel, current through is Thus, current through lamp and conductor of  in series is 1A. Also PD across lamp