How can a 60W bulb only draw 60W of power if it's internal resistance is 19 ohms? Or does the resistance suddenly increase once the filament heats up?
Thanks.
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19 years ago
incandescent bulb power consumption
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- posted
19 years ago
Thanks. That makes perfect sense now...
19up?
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19 years ago
Oh yea! Typical 5/1, sometimes more.
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19 years ago
Yes, considerably. In the UK, with about 235 V mains ac voltage, a 60W bulb would have a hot resistance of about 1k.
-- Terry Pinnell Hobbyist, West Sussex, UK
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19 years ago
Measuring the resistance of a light bulb is a common elementary circuits class laboratory to get students thinking about resistance as not being particularly fixed. It's very enlightening to many of them!
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19 years ago
I believe this site should give you the information for which you are looking. Cheers!
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19 years ago
Your question has been answered in previous posts but for your interest it is precisely that phenomena which is exploited when a small filament bulb is used for amplitude control in a Wein bridge oscillator.
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19 years ago
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