| Five bulbs \[{{B}_{1}},\]\[{{B}_{2}},\]\[{{B}_{3}},\] and \[{{B}_{4}}\] each of rating 60W/200V and \[{{B}_{5}}\] of rating 120W/400V are connected as shown in circuit. Total power consumption by all the bulbs is: |
 |
A) 240 W
B) 270 W
C) 90 W
D) 180 W
Correct Answer: D
Solution :
| \[{{P}_{{{B}_{1}}+{{B}_{2}}}}=30\,W\] |
| \[{{P}_{{{B}_{3}}}}=60\,W\] |
| \[{{P}_{{{B}_{4}}}}=60\,W\] |
| \[{{P}_{{{B}_{5}}}}=\frac{{{(200)}^{2}}}{\frac{{{400}^{2}}}{120}}=\frac{120}{4}=30\,W\] |
| \[{{P}_{\text{total}}}=180\,W\] |
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