An electric heater is used to boil 5.76 L of water in 20 minutes. What is appropriate kilowatt rating of the electric heater? Ans. 2 kW
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- An electric heater is used to boil 5.76 L of water in 20 minutes. What is the Appropriate kilo-watt rating of the electric heater?What would the MPGe of an otherwise identical vehicle be if running on an electric motor, if you pay 15 cents per kilowatt-hour to charge it? Assume the price of gasoline is $2.79/gallon.A person turns the shower on The electric hot water system and hot water delivery system are 75% and 65% The tap water temperature is 16.0 °C. The comfortable water temperature range is 40-48c. Current unit price of electricity is $0.274 per kWh. If 50.0 L of warm water was used for the shower, what is the difference in the cost if the shower used warm water at 40.0 °C and at 48.0 °C?
- A four-unit apartment has the following electric ranges, a 15kw, a 14 KW, a 10 kilowatt and a 9KW. What is the kilowatt demand added to the service of these RANGES?An electric cooker operates at 12A of current when connected to a 240 V supply for 1 hour a day. The electricity bill for a month (30 days) in OMR for a unit price of 20 baisa is..The cost to operate a clothes dryer for a year is $80.25. If the rate for electrical energy is 8.8¢/kWh, and the clothesdryer is used for 700 hours in a year, what is the power rating of the clothes dryer?
- What is the thermal efficiency of a coal fired thermal plant having a coal consumption of 0.48 kg/kWh and the calorific value of coal used is 6200 kcal/kg?1. An appliance draws 1A of current when plugged to a 220V outlet. It was further measured that the current lags the voltage by 32 degrees. What is the power factor of the device? (2 decimal places)1000W electric heater with 85% of efficiency is replaced by a 1000W electric heater with 95% efficiency. if heater is operated in a 8-hour shift for 5 days a week, what is the annual kwh savings?
- A light bulb consumes 144o watt-hours per day. How long does it take to consume 4680 watt-hours?An appliance draws 1 ampere of current when plugged to a 220-volt outlet. It was further measured that the current lags the voltage by 31 degrees. What is the power factor of the device?How many pounds of coal must be burned to keep one 100-watt light bulb lit for one hour? Assume the efficiency of the power plant is 35%, the transmission losses are 10% of the delivered power, and the heating value of coal is 12,000 BTU/lb.
