If, for example, your electric water kettle provided 75J of thermal energy to heat the water for every 100J of electrical energy consumed from the outlet, calculate the efficiency of your electric water kettle in heating the water (as a decimal).
Efficiency is defined as the required output to the input provided .Here output is 75 joules of thermal energy and input is 100 joules of electrical energy
Therefore efficiency is 75/100=0.75 or 75 percent
If, for example, your electric water kettle provided 75J of thermal energy to heat the water...
A kettle of water has just boiled. At that moment the water inside contains roughly 775 kJ of thermal energy. a) After three hours resting on the counter, the water in the kettle has cooled to room temperature, losing about 170 kJ of thermal energy in the process. Where did that thermal energy go, and by what process(es)? b) Has the quality of the water’s thermal energy increased or decreased? Explain. You have just invented a new light bulb which...
Electrical Energy objective Measure the specific heat of water using an electric heating element АС Power Supply VRMs = 6.30 Volts Electric power P = VI Pava = VRMS IRMS Thermal power Q = mc AT dQ = mc dT w pode - cmwcw+m ca de Calorimeter Water
A 1500 W electric kettle is used to heat 2.0 kg of water that is initially at 20C. What is the water temperature after 6 minutes?
Thermal Efficiency Internal Heat Energy AQ (J) Energy Lost (1) Material Work (J) Thermal Efficiency (%) Aluminum 89.89 63.55 26.34 70.70 Brass 49.09 39.74 9.35 80.95 3.) Show your work. Aluminum Energy Lost-89.89-63.55=26.34 J Aluminum Thermal Efficiency (%). e=q/w = 63.55/89.89x100=70.70% Friction Heating - 5 Brass Energy Lost- 49.09-39.74=9.35J Brass Thermal Efficiency..(%)-e=q/w = 39.74/49.09 x100=80.95% Results and Questions 1.) Give the equation you used to calculate the Power required to lift the mass. 2.) How did the internal energy change...
A small electric immersion heater is used to heat 57 g of water for a cup of instant coffee. The heater is labeled "140 watts" (it converts electrical energy to thermal energy at this rate). Calculate the time required to bring all this water from 22°C to 100°C, ignoring any heat losses. (The specific heat of water is 4186 J/kg-K.) Number Units the tolerance is +/-2%
A small electric immersion heater is used to heat 57 g of water for a cup of instant coffee. The heater is labeled “190 watts” (it converts electrical energy to thermal energy at this rate). Calculate the time required to bring all this water from 24°C to 100°C, ignoring any heat losses. (The specific heat of water is 4186 J/kg·K.) How can I solve this problem?
The energy entering an electric heater by electrical transmission can be converted to internal energy with an efficiency of 100%. By what factor does the cost of heating your home change when you replace your electric heating system with an electric heat pump that has a COP of 4.00? Assume the motor running the heat pump is 100% efficient.
(b) An ocean thermal gradient electric generating system (OTEC) is proposed for siting in Oman. This system would operate a heat engine driven by heat flow from warm ocean water (cooled from 27°C to 25 °C in the heating heat exchanger of the system), and cooled by heat flow to cold ocean water (which is heated from 3 °C to 5 C in the cooling heat exchanger of the system). The ocean water used in the different parts of the...
Electric water heaters have heating elements mounted in the tank. The input current in the water heater is 3.56 A and potential difference (Voltage) across it is 240 V. When the heater is switched on for 10 minutes, what could be the input power and electrical energy (in kWh) taken by water heater? If the efficiency of water heater is found to be 90 % due to energy loss, then how will you evaluate the practical output power generated by...
Q.8: An electrical power plant operates on the basis of thermal energy generated in a pressurized water reactor. The electrical power output of the plant is 1 GW, and its efficiency is 30% (a) Find the total power generated by the reactor. (b) How much power is discharged to the environment as waste heat? (c) Calculate the rate of fission events in the reactor core (Let the energy produced per fission event be 200MeV) (d) Calculate the mass of 235U...