when
connected to a 10 V battery. Calculate the resistance of the electric lamp.
(b) 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:
(a)
Let the resistance of the lamp
Resistance of conductor 
Total resistance in series, 
Current 
Voltage (V) = 10 V
Using
Ohm's law, V= IR
(b) Now, a resistance of 
is
connected in parallel with the series combination. Therefore, the total resistance
of the circuit is given by
Hence, current flowing in the circuit,
Thus, 1 A current will flow through resistor and 1 A will flow through
the lamp and conductor of 
resistance.
Hence, there will be no change in current flowing through . conductor. Also, there will be no
change in potential difference across the lamp. 
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