The diagram shows a circuit with three identical lamps.
The ammeter, A1, shows a reading of 1.5 A.
a) Indicate on the diagram where you would insert a switch so that it will
switch on or off lamps L2 and L3, but will not affect lamp L1.
b) What name is given to this arrangement of connecting lamps?
c) What will be the reading on ammeter A2?
d) What will be the reading on the voltmeter?
Answers
Answer:
a.The switch should be placed between L1 and L2 so L1 won' t be affected.
b.Parallel combination.
c.Since bulbs are identical and Current varies in parallel,
reading of the ammeter A2 will be 1.5/3
=0.5A
d.Voltage is the same in parallel combination,
therefore, V=6V+6V
=12V.
Given : diagram shows a circuit with three identical lamps.
The ammeter, A1, shows a reading of 1.5 A.
To Find : a) I where you would insert a switch so that it will switch on or off lamps L2 and L3, but will not affect lamp L1.
b) What name is given to this arrangement of connecting lamps?
c) What will be the reading on ammeter A2?
d) What will be the reading on the voltmeter?
Solution:
Switch will be inserted below L1 and above L2 so that it would not affect L1 but switch ON/OFF L2 and L3
arrangement of connecting lamps is Parallel connection
All lamps are identical hence Equal current will flow all bulbs
A1 shows total Current
Hence Current though L2 = Total / 3
Reading in A2 = 1.5/3
=> Reading in A2 = 0.5 A
Reading in Voltmeter = (6 - (-6)) = 12V
As in parallels voltage will be same in each .
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