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Two light bulbs in the circuit have rating $A\,[24\ V, 48\,W]$ and $B\,[24\ V, 36\,W]$ as shown.
  • AWhen switch is closed bulb $A$ delivers $24\ watt$  $\&$  $B$ delivers $18\ watt$ .
  • BWhen switch is open $A$ delivers $9\ watt$  $\&$  $B$ delivers $12\ watt$ approximately.
  • CWhen switch is open $A$ delivers $24\ watt$  $\&$  $B$ delivers $18\ watt$ approximately.
  • DWhen switch is open $'A'$ delivers $6\ watt$ and $B$ delivers $9\ watt$ approximately.
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