When an electric company can’t meet its customers’ demand for electricity on a hot summer day, should the problem be called an “energy crisis” or a “power crisis”? Explain.
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When an electric company can’t meet its customers’ demand for electricity on a hot summer day, should the problem be called an “energy crisis” or a “power crisis”? Explain.
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- Check Your Understanding From the examples, how does the energy of a lightning strike vary with the height of the clouds from the ground? Consider the cloud-ground system to be two parallel plates.A large household air conditioner may consume 15.0 kW of power. What is the cost of operating this air conditioner 3.00 h per day for 30.0 d if the cost of electricity is $0.110 per kW h?Compare the cost to make 48 kg of ice using two different refrigerators; one has a COP of 5.00 and the other has a COP of 6.00. Electricity costs $0.10 per kWh. Using the same assumptions given in the example, find the cost difference (in dollars) between the refrigerators to freeze the water.
- Which one of the following is the unit of energy? kilowatt mole kilowatt hour O kg/m3A stationery shop use the following electric appliances: (i) Four Air Conditioner of rating 1900 W for twelve hours each day (ii) Two Electric Freezer of rating 1000W each for 24 hours each day (iii) Ten electric tube lights of rating 25W each for 12 hours each day. Calculate the electricity bill of the stationery shop for the month of November 2020 if the cost per unit of electric energy is 25 Bz/ kWh. ) Electrical Energy(in kWh) consumed by Air conditioners of rating 1900 W for 12 h of each day= (ii) Electrical Energy(in kWh) consumed by Electric Freezer of rating 1000 W for 24 h of each day= %D (iii) Electrical Energy(in kWh) consumed by Tube light of rating 25 W for 12 h of each day = %3D (iv) Total energy(in kWh) consumed in the month November'2020 =Here is an extract from our electricity bill. The coloured text has been added to highlight the rate, with the 'rate' being the price per kW.hr: We buy electrical energy at ENERGY RATE COST USED 92 Days 294.3 kWh 24.9000c $73.27 ENERGY PURCHASED RATE CREDIT (03/12/13 - 04/03/14) 92 Days 6.6000c 883.4 kWh $58.30 but we sell them (solar) electrical energy at Over the 92 days of this bill, what is the average rate at which the company supplied energy to this household? P = Watts. (Take the 92 days as 2 significant figures: the electricity meter is read by an employee whose time of reading could be at any time during the day.) Also, don't give an answer, but think about how many 'labourers' (using the example in the lesson) we would need to employ to provide energy at this average rate.
- It is often claimed that you should leave the heating system in your house on all the time rather than turning it off when you are not home because it takes more energy to heat the house back to its normal temperature. What do you think? True or False?A stationery shop use the following electric appliances: (i) Four Air Conditioner of rating 1900 W for twelve hours each day (ii) Two Electric Freezer of rating 1500W each for 24 hours each day (iii) Ten electric tube lights of rating 20W each for 12 hours each day. Calculate the electricity bill of the stationery shop for the month of November 2020 if the cost per unit of electric energy is 15 Bz/ kWh. (i) Electrical Energy (in kWh) consumed by four Air conditioners of rating 1900 W for 12 h of each day= (ii) Electrical Energy (in kWh) consumed by two Electric Freezers of rating 1500 W for 24 h of each day= (iii) Electrical Energy (in kWh) consumed by ten Tube lights of rating 20 W for 12 h of each day =A stationery shop use the following electric appliances: (i) Four Air Conditioner of rating 1900 W for twelve hours each day (ii) Two Electric Freezer of rating 1500W each for 24 hours each day (iii) Ten electric tube lights of rating 20W each for 12 hours each day. Calculate the electricity bill of the stationery shop for the month of November 2020 if the cost per unit of electric energy is 15 Bz/ kWh. (i) Electrical Energy(in kWh) consumed by four Air conditioners of rating 1900 W for 12 h of each day= (ii) Electrical Energy(in kWh) consumed by two Electric Freezers of rating 1500 W for 24 h of each day= (iii) Electrical Energy(in kWh) consumed by ten Tube lights of rating 20 W for 12 h of each day = (iv) Total energy(in kWh) consumed in the month November'2020 = (V) Electricity bill(in riyals) for the month of November'202 =
- Allan Ahmed Nasser Al-Abri A small vegetable shop use the following electric appliances: (i) Two Air Conditioner of rating 1900 W for ten hours each day (ii) Two Electric Freezer of rating 500W each for 24 hours each day (iii) Ten electric tube lights of rating 25W each for 12 hours each day. Calculate the electricity bill of the vegetable shop for the month of November 2020 if the cost per unit of electric energy is 20 Bz/ kWh. ) Electrical Energy(in kWh) consumed by two Air conditioners of rating 1900 W for 10 h of each day= (ii) Electrical Energy(in kWh) consumed by two Electric Freezer of rating 500 W for 24 h of each day= (iii) Electrical Energy(in kWh) consumed by ten Tube light of rating 25 W for 12 h of each day = (iv) Total energy(in kWh) consumed in the month November 2020Solar panels are rated by their theoretical maximum output capacity. A 2-kW PV panel would theoretically produce 2 kW of electricity at its maximum output (during peak solar radiance). If the average daily peak sun-hours in Philadelphia are approximately 4.0 hr and a rowhome is outfitted with 10 PV panels each having a capacity of 260 W, how much energy (kilowatt x hours) would be generated in one year (in units of kWh/year)?What is the useful energy output when a 60 W light bulb is on for 2 hours?Recall, traditional light bulbs are only 5% efficient.