For instance, you could kiss your kids on their heads rather than their cheeks for a few days. You could ask your spouse to do bedtime stories and baths for a few nights. But obviously, you canât be so careful in your efforts to prevent germs from spreading that you feel like youâre shunning your kids.
If you grow short plants, you should definitely try LEDs. 1  The first series of costs on the chart represents an electricity cost of $0.12/kwH, or 12 cents per kilowatt hour (a kilowatt hour is 1,000 watts being used for one hour). 2  $0.12/kwH was the US national average cost for electricity in 2011.
Annual cost: The utility rate is 11 cents per kWh. 547.5 kWh Ã $0.11/kWh = $60.23/year. II. Following the steps above, find the annual cost to operate a paper shredder. 1. Estimate of time used: The shredder is used for about 15 minutes per day (0.25 hour).attage: The wattage is on the label and is listed at 1500 W. 3. Daily energy consumption:(1,500 W Ã 1) Ã· 1,000 = 1.5 kWh 4. Annual energy consumption: The kettle is used almost every day of the year.1.5 kWh Ã 365 = 547.5 kWh 5. Annual cost: The utility rate is 11 cents per kWh.547.5 kWh Ã $0.11/kWh = $60.23/year II.