I have a simple circuit running off a battery powering a lightbulb (bulb A). If I add another light (bulb B) parallel to bulb A I can expect that the voltage across bulb A will _________ and bulb A will shine___________.

Question

I have a simple circuit running off a battery powering a lightbulb (bulb A). If I add another light (bulb B)  parallel to bulb A I can expect that the voltage across bulb A will _________ and bulb A will shine___________.

BlackTom AI · Accepted Answer

To analyze the effect of adding a second light bulb (bulb B) in parallel to bulb A in a simple circuit powered by a battery, we consider how parallel circuits behave and how voltage and current relate to bulbs.
Option 1: 'decrease, dimmer' — In a true parallel configuration, the voltage across each branch remains the same as the source, so bulb A’s voltage does not decrease when bulb B is added in parallel. Therefore, this option misstates the voltage and the resulting brightness.
Option 2: 'stay the same, the same as before (but the battery will run out faster)' — In parallel, each branch across the same supply voltage experiences the full battery voltage, so bulb A’s voltage is unchanged. However, adding another bulb increases the total current drawn from the battery, which makes the battery deplete faster (assuming the battery has finite capacity). This description correctly captures both the unchanged voltage across bulb A and the increased overall power consumption leading to faster battery depletion, which indirectly affects run-time.
Option 3: 'all of them' — This would imply that adding bulb B changes both voltage and brightness of bulb A in some unspecified way, or that all potential outcomes occur simultaneously, which is not accurate for a standard parallel connection where bulb A’s voltage remains constant.
Option 4: 'increase, brighter' — The voltage across bulb A does not increase merely because a second identical bulb is added in parallel. In an ideal battery and wiring scenario, the voltage stays the same and brightness of bulb A remains determined by that constant voltage, so this option is incorrect.
In summary, the key physics idea is that a parallel addition keeps the voltage across each branch equal to the source, so bulb A’s voltage stays the same, while the total current from the battery increases, reducing overall battery life. The option that states 'stay the same, the same as before (but the battery will run out faster)' correctly reflects both aspects of the situation.

Physics Honors-Henrikson Unit 11 and part of 12 Test part 1

I have a simple circuit running off a battery powering a lightbulb (bulb A). If I add another light (bulb B) parallel to bulb A I can expect that the voltage across bulb A will _ and bulb A will shine___.

查看解析

登录即可查看完整答案

类似问题

Which is correct concerning a parallel circuit?

Which is correct concerning a parallel circuit?

Which statement is correct when made in reference to a parallel circuit?

Which is correct in reference to electrical resistance?

The lamps in a string of decorative lights are connected in parallel across a constant-voltage power source. What happens if one lamp burns out? (Assume negligible resistance in the wires leading to the lamps.)

When unequal resistors are connected in parallel in a circuit,

In the circuit below, i = 4.0 Amps, R1 = 5.8Ω and R2 = 3.5Ω. Find Vs in Volts to 2dp.

If I add a completely parallel branch to an existing circuit then the equivalent (or total) resistance of the circuit will..

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单