- #1
EMEE_
- 11
- 0
- Homework Statement
- How long will it take to boil 1 liter of water from 20°C? The heat efficiency / η is 85% , voltage / U 230V and power / P 200W. The answer must be given in seconds.
- Relevant Equations
- ?
Hi.
I have been trying to solve the following problem
ow long will it take to boil 1 liter of water from 20°C? The heat efficiency / η is 85% , voltage / U 230V and power / P 200W. The answer must be given in seconds.
So,
t1 = 20°C
t2 = 100°C
Δt = 80°C
V = 1,0 liter → m = 1,0 kg
ηkettle = 85%
U = 230V
P(the power needed to boil water) = 200W
So far I have solved the energy consumed in boiling water: E = c * m * ∆t = 334400_J (joules) Have I used the right formula? And what formulas can I use?
Hopefully, someone here can help me!
I have been trying to solve the following problem
![Gah! :H :H](/styles/physicsforums/xenforo/smilies/arghh.png)
So,
t1 = 20°C
t2 = 100°C
Δt = 80°C
V = 1,0 liter → m = 1,0 kg
ηkettle = 85%
U = 230V
P(the power needed to boil water) = 200W
So far I have solved the energy consumed in boiling water: E = c * m * ∆t = 334400_J (joules) Have I used the right formula? And what formulas can I use?
Hopefully, someone here can help me!