- #1
justadream
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I understand that generally, power and light bulb brightness are directly proportional. However, because there are so many ways to write the power formula (P=IV = I^2 * R = V^2 / R), I was a bit confused about what factors actually determine power and wanted to confirm whether the following is correct:
If Potential = Constant*, bulb with LOWER RESISTANCE = Brighter (since I is higher from V=IR)
If Current = Constant and potential different#, bulb with HIGHER RESISTANCE = Brighter (since V is higher from I=V/R)
*Have a single bulb connected to battery; or have multiple bulbs connected in parallel
#Have multiple bulbs connected in series
Are there any other scenarios I should be aware of when determining brightness?
Can I make any sweeping statements like "brightness and current are directly proportional" that are applicable to all scenarios?
Thanks!
If Potential = Constant*, bulb with LOWER RESISTANCE = Brighter (since I is higher from V=IR)
If Current = Constant and potential different#, bulb with HIGHER RESISTANCE = Brighter (since V is higher from I=V/R)
*Have a single bulb connected to battery; or have multiple bulbs connected in parallel
#Have multiple bulbs connected in series
Are there any other scenarios I should be aware of when determining brightness?
Can I make any sweeping statements like "brightness and current are directly proportional" that are applicable to all scenarios?
Thanks!