How many joules of energy are supplied.

  • #1

Homework Statement


How many coulombs of electricity pass through a lamp when a current of 5A flows for 3 minutes. Answer: 900C
In this time 27,000 joules of electrical energy is converted into heat and light. How many joules of energy are supplied by each coulomb.

Homework Equations


V=W/q
E=Pt
P=VI

The Attempt at a Solution


27000/900 = 30V
P=30 x 5 = 150W
E= 150 x 180 = 2700

Have I done this correctly?
 

Answers and Replies

  • #2
Your first part is correct, not sure what you're trying to do with all those other equations listed though to calculate how much energy is supplied by each coulomb. It's a lot easier than what you're trying to do.
 
  • #3
NascentOxygen
Staff Emeritus
Science Advisor
9,244
1,072
one volt is one Joule/coulomb
 

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