Find the energy given from a lightbulb

  • Thread starter Thread starter AnomalyCoder
  • Start date Start date
  • Tags Tags
    Energy Lightbulb
Click For Summary
SUMMARY

The discussion centers on the energy consumption of two light bulbs: Bulb A rated at 25 Watts and Bulb B rated at 100 Watts, both connected to a 120-volt socket. Calculations reveal that Bulb B consumes 1000 Joules over 10 seconds, while Bulb A consumes 250 Joules, confirming that Bulb B uses four times more energy than Bulb A. The inclusion of the 120-volt voltage difference serves to contextualize the power ratings and potential current comparisons, although it does not affect the energy calculations directly.

PREREQUISITES
  • Understanding of electrical power calculations (Watts = Joules/Seconds)
  • Basic knowledge of voltage and its role in electrical circuits
  • Familiarity with energy consumption metrics
  • Ability to perform unit conversions and calculations
NEXT STEPS
  • Research the relationship between voltage, current, and power using Ohm's Law
  • Explore energy consumption calculations for various electrical appliances
  • Learn about the efficiency ratings of light bulbs, including LED vs. incandescent
  • Investigate the impact of voltage on energy consumption in different electrical systems
USEFUL FOR

Students studying physics or electrical engineering, educators teaching energy concepts, and anyone interested in understanding energy consumption in household appliances.

AnomalyCoder
Messages
29
Reaction score
0

Homework Statement


You have two light bulbs: Bulb A is rated at 25 Watts and Bulb B is rated at 100 Watts. You plug it into a standard light socket that provides a voltage difference of 120 volts.
Which light bulb will use more energy during the same period of time? How many more?

Bulb A = 25 Watts
Bulb B = 100 Watts.

Homework Equations


Watts = Joules/Seconds

The Attempt at a Solution


Bulb A : 25 = Joules/10 seconds , you end up with 250 = x
Bulb B : 100 = Joules/10 seconds , you end up with 1000 = x
Bulb B, 4 times more energy.

The only questions I really have about this are:
Did I get the right solution?
Why was the voltage difference of 120 volts included in the problem for?
Is it just irrelevant information designed to trick an innocent student?
 
Physics news on Phys.org
The only other reason I can think of giving you V= 120V is if you decide to compare the currents that each use. In which you will still get that bulb B uses more, since its power output is 100W.
 
Oh that makes sense.
Thank you for the quick reply!
 

Similar threads

Photon Arrival Rate, Chapter 1.5 from Computer Graphics by Folly
  • · Replies 15 ·
Replies
15
Views
3K
Current, voltage : brightness of bulb in parallel or series
  • · Replies 2 ·
Replies
2
Views
4K
How many Photons per second are entering the pupil?
  • · Replies 6 ·
Replies
6
Views
5K
Calculating Energy Stored and Dissipated in a Capacitor Discharge
  • · Replies 1 ·
Replies
1
Views
2K
Resistors (lightbulbs) Power & Brightness
  • · Replies 13 ·
Replies
13
Views
4K
How long can the battery power the lightbulb?
  • · Replies 3 ·
Replies
3
Views
2K
Electrical power of a lightbulb
  • · Replies 2 ·
Replies
2
Views
2K
Power Dissipated by 60W Bulb in 20V Source[/B]
  • · Replies 17 ·
Replies
17
Views
2K
Transformer and the brightness of bulbs
  • · Replies 11 ·
Replies
11
Views
3K
How do I calculate the power output of the lightbulb?
  • · Replies 15 ·
Replies
15
Views
11K