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InterviewSolution
| 1. |
Why filament-type electric bulb are not power efficient |
| Answer» The\xa0filament type\xa0- or Tungsten -\xa0bulb\xa0works on the principle that when currenr is passed through thefilament, it heats up turning into red, yellow and finally the yellowish white - which is the light we get. Now getting light by the process of excessive heating means that most of\xa0power\xa0is wasted as heat. | |