How many joules of energy are supplied.

  • Thread starter Thread starter AHUGEMUSHROOM
  • Start date Start date
  • Tags Tags
    Energy Joules
AI Thread Summary
A current of 5A flowing for 3 minutes results in 900 coulombs of electricity passing through a lamp, converting 27,000 joules of energy into heat and light. The calculation shows that each coulomb supplies 30 joules of energy, derived from dividing the total energy by the total charge. The discussion highlights the relationship between voltage, energy, and charge, emphasizing that one volt equals one joule per coulomb. The initial calculations are confirmed to be correct, but the additional equations presented are deemed unnecessary for this specific problem. The focus remains on understanding the energy supplied per coulomb in the context of electrical circuits.
AHUGEMUSHROOM
Messages
21
Reaction score
0

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?
 
Physics news on Phys.org
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.
 
one volt is one Joule/coulomb
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Law of Conservation of Energy Proof
Replies
22
Views
2K
Confused about voltage & current -- Please check my understanding
Replies
2
Views
2K
Electric Potential Energy and micro-joules
Replies
3
Views
1K
How Much Mass Converts to Energy in a Nuclear Plant Over a Month?
Replies
2
Views
2K
How many joules of heat will be delivered to the room
Replies
13
Views
2K
How Many Food Calories with Efficiency %
Replies
1
Views
4K
Unit Joule is the unit of work and of kynetic energy
Replies
16
Views
5K
How to work out Joules needed to perform work
Replies
16
Views
7K
Time for which RTG will supply the required energy output?
Replies
15
Views
2K
Calculating Energy Requirements for a Humidifier Operating at the Boiling Point
Replies
1
Views
3K

Hot Threads

Recent Insights

Back
Top