D. Answer the following questions based on all the circuits you have considered
ID: 1551993 • Letter: D
Question
D. Answer the following questions based on all the circuits you have considered so far. You may also experiment with any additional circuits you would like to try. (For this problem, the bulbs here arc fixed at constant resistance). Is it possible to change the potential difference across a real light bulb without also changing the current through it? (As in real life, you're not able to change the resistance of the bulb.) Explain. Is it possible to change the current through a real light bulb without changing the potential difference across it? Explain. Consider how changes in current through and potential difference across a light bulb relate to changes its brightness. Circle the correct answer: If a light bulb becomes brighter, the current through it has... (increased, decreased, stayed the same, can't know for sure). If a light bulb becomes brighter, the potential difference across it has... (increased, decreased, stayed the same, can't know for sure). Check your answer with a tutorial instructor.
Explanation / Answer
1. yes if we add another resistance in series with given light bulb .and potential difference of light bulb will get changed keeping the current same.
2.yes, if we add another resistance in parallel with given light bulb. the potential difference across light bulb will remain same but current will get changed.
3.if light bulb become brighter, current through it has increased. brightness is just a measure of the number of photons. When you increase the current in a bulb wire it gets hotter and emits more photon. When you increase the voltage, you increase the current. SO .... more voltage => more current => more photons => brighter
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