SOLUTION: In an electric kettle with good insulation, o.85kg of water is warmed by an electric reisitor of 25 ohms which is connected to avoltage of 230V. in what time will the temperature o

Question 428605: In an electric kettle with good insulation, o.85kg of water is warmed by an electric reisitor of 25 ohms which is connected to avoltage of 230V. in what time will the temperature of water rise by 20 degress celcius? specific heat capaicty of water is 4190j/kg *c
Found 2 solutions by solver91311, htmentor:
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

This is a math site. Unless you provide the formula, take your question to a site that does physics. Try the physics board on Cramster.

John

My calculator said it, I believe it, that settles it

Answer by htmentor(1343) (Show Source): You can put this solution on YOUR website!
This would seem to be a physics problem rather than a math problem. But the solution is as follows:
The energy gained by the water due to heating = mass of the water * specific heat * temperature rise:
E = mcT
The power dissipated in the resistor is given up as heat in the water.
. The power units are J/s. Therefore, the total energy given to the water in the form of heat in t seconds is:
2116 J/s * t
So we have
2116 J/s * t = 0.85 kg * 4190 J/k/deg-C * 20 deg-C
Solve for t:
t = 4190*20*0.85/2116 = 33.66 sec.
RELATED QUESTIONS
An electric current (c) varies inversely as the resistance (r) of the circuit. c1= 6... (answered by Mathtut)
A total of 0.8 kg of water at 20 deg. C is placed in 1 kW electric kettle. How long a... (answered by Fombitz)
The current I that flows through an electrical appliance is determined by I = square... (answered by Nate)
The power in an electric circuit varies inversely with the resistance. If the power is... (answered by solver91311)
the resistance(R) of an electric wire is in inverse proportion to the square of its... (answered by scott8148)
moving electric charge produces only an electric field. any of these, depending... (answered by Alan3354)
The electric l (in amperes) passing through a resistor is related to the voltage V across (answered by Theo)
An electric kettle contains 1.5 litres of water at 20°C. Find; a) the heat required to (answered by math_helper)
Question: If the voltage, V, is an electric circuit is held constant, the current, I , is (answered by Alan3354)