An electric water heater holds 202 L. If electricity costs 0.13 $ per kWh, how much does it cost to raise the water temperature from 20 ∘C to 90 ∘C?
An electric water heater holds 202 L. If electricity costs 0.13 $ per kWh, how much...
How much energy in kWh would a heater rated at 7 kW use when run for 9000 seconds? If the cost of electricity is 1.4 $/kWh, how much does it cost to run the heating system for 9000 seconds ?
How much energy in kWh would a heater rated at 7 kW use when run for 9000 seconds? If the cost of electricity is 1.4 $/kWh, how much does it cost to run the heating system for 9000 seconds?
How much energy in kWh would a heater rated at 9 kW use when run for 300 minutes? If the cost of electricity is 1.2 $/kWh, how much does it cost to run the heating system for 300 minutes.
4. How much water is needed to produce 1 kWh of electricity at a power plant that is 30% efficient if the temperature of the water is allowed to increase by 10 degree C ? {please consider that the water is used to for cooling, cooling the waste heat}
The 120 V electric heater in a coffee maker has a resistance of 15 Ω. How long will it take for this heater to raise 7 cups (1540 g) of water from 20∘C to the ideal brewing temperature of 90∘C? Express your answer in minutes.
In this problem, we consider replacing an existing electrical water heater with an array of solar panels. The net installed investment cost of the panels is $1,365 ($2,100 less a 35% tax credit from the government). Based on an energy audit, the existing water heater uses 180 kilowatt hours (kWh) of electricity per month, so at $0.13 per kWh, the cost of operating the water heater is $23.4 per month. Assuming the solar panels can save the entire cost of...
A 150 L (= 40 gal) electric hot-water tank has a 5.0 kW heater. How many minutes will it take to raise the water temperature from 61.0 F to 151 F? Express your answer with the appropriate units.
In this problem, we consider replacing an existing electrical water heater with an array of solar panels... Answer all parts of question if there is multiple parts not just what's below the line please ;) In this problem, we consider replacing an existing electrical water heater with an array of solar panels. The net installed investment cost of the panels is $1,080 ($1,800 less a 40% tax credit from the government). Based on an energy audit, the existing water heater...
An electric heater is used to boil small amounts of water and consists of a 10-Ω coil that is immersed directly in the water. It operates from a 120-V socket. How much time is required for the heater to raise the temperature of 0.38 kg of water from 29 °C to the normal boiling point? Take the specific heat capacity of water to be 4186 J/(kg·C°).
How long does a 57 kW water heater take to raise the temperature of 110 L of water from 24°C to 37°C? The specific heat of water is 4186 J/kg·K. The density of water is 1.00 g/cm3.