Engineering, 05.11.2019 01:31 jillianbarnes2565

Electric power is often used to generate heat. you might use an electric kettle to heat up 12 ounces of water for a mug of tea. water has a very high heat capacity, so this uses a lot of energy. we can use the specific heat of water (cwater = 4186 j/kgºc) to calculate the total energy e required to heat the water: e = cmδt, where c is specific heat, m is the mass of water, and δt is the change in temperature. assume that the water starts at room temperature (25 degree c). how much energy (in joules) is required to heat the water to boiling (100 degree c? if the price for electricity is 10.78c/kwh from pacific power in oregon, how many mugs of tea can you make for $1? (assume that water and tea are free, and assume that the water absorbs all of the electric power delivered. note: these are generally unsafe assumptions.) your electric kettle operates at a constant current of 10a and a constant voltage of 120v. how much energy does it consume in five minutes of continuous operation? how many mugs of tea can this heat? how much would this energy cost using the pacific power rate in 2b?

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