Work out the units. What is a watt? How many grams of water are in 1 liter?rgold said:Homework Statement
The mechanical equivalent of heat is 1cal=4.18J. The specific heat of water is 1cal/g*K and its mass is 1g/cm^3. an electric immersion water heater rated at 400 W should heat a liter of water from 10C to 30C in about how much time
Homework Equations
R=v/i
power=v*i
The Attempt at a Solution
I know the answer is 3.5 minutes but i do not know how to get there. I am pretty lost.[/B]
SteamKing said:Work out the units. What is a watt? How many grams of water are in 1 liter?
BTW, the formulas in Section 2 won't help you with this problem, since you don't know voltage, current, or resistance.
you should calculate amount of heat required to raise the water from t1 to t2 given -then calculate the time taken by the heater to provide that heat-rgold said:The mechanical equivalent of heat is 1cal=4.18J. The specific heat of water is 1cal/g*K and its mass is 1g/cm^3. an electric immersion water heater rated at 400 W should heat a liter of water from 10C to 30C in about how much time
Homework Equations
R=v/i
power=v*i
rgold said:im still confused i know that a watt is joules per second and that 100 grams of water in a liter but how do i connect everything?
The time it takes for an electric immersion water heater to heat up depends on the size of the heater, the initial temperature of the water, and the desired temperature of the water. On average, it can take anywhere from 20-30 minutes to heat up a full tank of water.
Yes, most electric immersion water heaters come with a built-in timer that allows you to set the heating time according to your needs. This feature is especially useful for saving energy and reducing electricity costs.
The lifespan of an electric immersion water heater can vary depending on usage and maintenance. However, on average, it is recommended to replace your heater every 8-10 years to ensure optimal performance and efficiency.
To ensure safety and prevent any potential hazards, it is not recommended to leave an electric immersion water heater on overnight. It is best to turn off the heater when not in use and only turn it on when needed.
Signs that your electric immersion water heater may need to be replaced include a decrease in water temperature, strange noises coming from the heater, and an increase in electricity bills. If you notice any of these signs, it may be time to replace your heater.