How to determine the brightness of a light bulb

  • Thread starter cy19861126
  • Start date
  • #1
69
0
In general, does more current/less resistence mean the brighter of the light bulb? How does voltage take into account in this case
 

Answers and Replies

  • #2
ranger
Gold Member
1,676
1
Both the current and voltage contributes to the brightness. It just depends on the configuration. If an incandescent is 100% efficient (with it isnt btw), that means all power (V*I) would be used to produce visible light rather than 90% being wasted as heat.
 
  • #3
312
0
"Brightness" is a measure of power, so at constant voltage power is I^2R. If resistance is decreased and current is increased by an equal factor, the increase in current counts for more and the bulb will appear brighter
 
Top