Register to reply

What does power have to do with light bulbs?

by accelerate23
Tags: bulbs, light, power
Share this thread:
accelerate23
#1
Apr18-12, 08:39 PM
P: 11
power= work/time

Also:
Why are certain wattages of light bulbs brighter than others?
Phys.Org News Partner Physics news on Phys.org
Refocusing research into high-temperature superconductors
Neutron tomography technique reveals phase fractions of crystalline materials in 3-dimensions
Tiny magnets, huge fields: Nanoscale ferromagnetic electrodes create chemical equivalent of solid-state spin valve
russ_watters
#2
Apr18-12, 08:42 PM
Mentor
P: 22,252
Light is radiated power; Power is not just a mechanical thing.
haruspex
#3
Apr18-12, 10:19 PM
Homework
Sci Advisor
HW Helper
Thanks
P: 9,657
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.

Lsos
#4
Apr19-12, 02:30 AM
P: 774
What does power have to do with light bulbs?

Light is a form of energy (work). The more light you want, the more/ faster electrical energy you have to convert into light energy.
NascentOxygen
#5
Apr19-12, 08:29 AM
HW Helper
Thanks
P: 5,167
Quote Quote by accelerate23 View Post
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.
QuantumPion
#6
Apr19-12, 04:52 PM
P: 768
Quote Quote by NascentOxygen View Post
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.
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).


Register to reply

Related Discussions
Light bulbs Introductory Physics Homework 3
Why are light waves from 2 separate light bulbs incoherent? General Physics 5
Light bulbs Fun, Photos & Games 4
Fluorescent Bulbs and Power Bills Electrical Engineering 8
Recording power and lumens for light bulbs. Introductory Physics Homework 1