The fig below shows two similar bulbs X and Y connected to suitable power supply...
PHYSICS
JAMB 1995
The fig below shows two similar bulbs X and Y connected to 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
Correct Answer: B. Brightness Of Y will remain constant
Explanation
Diagram above shows a Parallel circuit If one of the parallel path is broken, current will continue to flow in other parts. Voltage is the same across each component of the parallel circuit. The brightness of a light bulb is given by its power. P = I2R, and so brightness depends on current and resistance. Hence; the brightness of Y will not be affected except for a variation in resistance property.
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