1. Please explain
b if a wire wore added to the circuit as shown in the diagram below would the current through: A
increase, decrease or remain the same? Explain your reasoning ii. buib B increase, decrease or
remain the same? Explain your reasoning. ii. the battery increase, decrease or remain the same?
Explain your reasoning 122
Solution
Since the wire introduced is a perfect conductor and is introduced in parallel to bulb B so no
current will flow through the bulb B and the attery will see three bulbs bulb C,D and A in
parallel.
i) Since the voltage aroubd bulb A remains same in both the cases so the current i.e I = V/R will
remain same in both the cases.
ii) Since initially there was some amount of current passing through battery and after connecting
a conducting wire in prallel to battery , no current passes through bulb B. SO current decreases.
ii) Assuming resistance R of each bulbs and calculating equivalent resistance we get R eq = 3R/5
So total inital current passing through battery is 5V/3R
Equivalent resistance after connecting wire R eq = R/3
So current flowing through the battery is 3V/R
So the current through battery increases