and 
are
three identical bulbs connected as shown in figure. Ammeters 
and 
are
connected as shown.
When all the bulbs glow, the current of 3 A is recorded by
ammeter A.
(a)What happens to the glow of the other two bulbs when
bulb 
gets fused?
(b) What happens to the reading of 
and
A when the bulb 
gets fused?
(c) How much power is dissipated in the circuit when all
the three bulbs glow together?
Answer:
Resistance
of combination of three bulbs in parallel
If R
is the resistance of each wire, then
or
or
Current in each bulb, 
(1)
(a)When bulb 
gets fused, the
currents in 
and 
remain
same 
so their glow remains
unaffected. (1)
(b) When bulb gets fused, the
current in becomes zero and currents in and remains
1 A.
Total current, 
Current in ammeter, 
Current in ammeter, 
Current in ammeter, 
Current in ammeter, 
(2)
(c) When all the three bulbs are connected.
Power decapitated, 
(1)
You need to login to perform this action.
You will be redirected in
3 sec
