Question 41
Electrical Energy and PowerThe diagram above shows two similar bulbs X and Y connected to a suitable power supply with F as an appropriate fuse rating. If the filament of X breaks, then the
- A.brightness of Y will reduce
- B.brightness of Y will remain constant
- C.brightness of Y will increase
- D.fuse F will blow
Show the answer and explanation
Answer: B (brightness of Y will remain constant)
Explanation
X and Y are connected in parallel, so each has the full supply voltage across it. If X's filament breaks, Y still gets the same voltage and current, so its brightness remains constant.