EARTH SCIENCE
MAGNETISM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a switch is never used
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all of the bulbs become dimmer if another bulb is added
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There are many paths for electricity to take
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the remaining 3 bulbs stay lit if one burns out
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Detailed explanation-1: -Increasing the number of bulbs in a series circuit decreases the brightness of the bulbs. In a series circuit, the voltage is equally distributed among all of the bulbs. Bulbs in parallel are brighter than bulbs in series.
Detailed explanation-2: -In a series circuit, as more bulbs are added, the brightness of each bulb decreases. This is because the resistance R increases which causes the current I through each bulb to decrease (recall I = V/R).
Detailed explanation-3: -When in series, bulbs become dimmer as the potential difference is shared equally across the bulbs. The current reads the same for each component. In parallel, each branch shows the same potential difference, so the bulbs on one branch will have the same relative brightness.
Detailed explanation-4: -Bulbs connected in parallel will be lit with the same brightness because they each receive the same amount of electricity.
Detailed explanation-5: -In a parallel combination, even if one of the bulbs blows out, the other bulbs will continue to glow as electricity still has a closed circuit to flow.