What does power have to do with light bulbs?

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Discussion Overview

The discussion revolves around the relationship between power and light bulbs, specifically addressing why different wattages result in varying brightness levels. It encompasses theoretical and conceptual aspects of light, energy, and electrical power in the context of incandescent and halogen bulbs.

Discussion Character

  • Conceptual clarification
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants define power as work divided by time and relate it to the brightness of light bulbs.
  • One participant notes that light is radiated power and emphasizes that power is not limited to mechanical contexts.
  • Another participant explains that incandescent bulbs use electrical energy to heat a filament, which radiates light, and that maintaining this heat requires continuous energy input, thus defining power in this context.
  • It is proposed that the amount of light produced is directly related to the rate at which electrical energy is converted into light energy.
  • Some participants suggest that higher wattages allow for either larger filament dimensions or higher temperatures, both of which contribute to increased brightness by enhancing the radiating surface or shifting the spectrum of emitted light.

Areas of Agreement / Disagreement

Participants present multiple competing views on the mechanisms behind brightness in light bulbs, particularly regarding the role of power, filament size, and temperature. The discussion remains unresolved with no consensus reached.

Contextual Notes

Participants do not fully explore the assumptions behind their claims, such as the efficiency of different bulb types or the specific characteristics of light emission across various technologies.

accelerate23
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power= work/time

Also:
Why are certain wattages of light bulbs brighter than others?
 
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Light is radiated power; Power is not just a mechanical thing.
 
Take the old incandescent bulbs. The electricity does work to heat the filament, causing it to radiate energy as light. That would cool it down again, so more electricity has to be used all the time to keep it hot. The rate of using electrical energy is power.
 
Light is a form of energy (work). The more light you want, the more/ faster electrical energy you have to convert into light energy.
 
accelerate23 said:
Why are certain wattages of light bulbs brighter than others?
More power enables you to heat a tungsten filament of greater dimension (in length or thickness)---to the same glowing temperature---so with more radiating surface, you have more light. More light = greater brightness.
F8N5g.gif
 
NascentOxygen said:
More power enables you to heat a tungsten filament of greater dimension (in length or thickness)---to the same glowing temperature---so with more radiating surface, you have more light. More light = greater brightness.
F8N5g.gif

Or heat the same size filament to a higher temperature, thus creating a larger portion of the radiated light in the visible spectrum (e.g. halogen bulbs). :cool:
 

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