Question

Lab 14 Electricity Bill Worksheet Background knowledge. The power of an electrical appliance is measured in watt (W). One watt is a measure of the energy used up in one second. The unit used for calculating power consumption is the kilowatt-hour (kWh). In order to calculate power consumed by an electrical appliance, we first convert the power to kilowatt (kW). For example, 800 W=0.8 kW, 2000 W = 2.0 kW and so on. One unit of power consumption is one kilowatt-hour(kWh). To obtain the number of units consumed, we multiply the power in kW with time used in hour. For example, if a 700 W refrigerator is used for 10 hours a day, the number of units 0.7 kW x 10 h = 7 kWh = 7 units. If a 2 kW immersion heater is used for 0.5 h a day, the number of units = 2 kW x 0.5 h=1 unit. Now follow directions and complete this worksheet. Directions: • Make a list of the appliances you have at home and their power ratings. Some common appliances and their power ratings are given below. You don't have to use these. Make your own list of appliances and their power. Refrigerator - 800 W; water heater - 3 kW; electric iron - 700 W; cooking range 1200 W; air conditioner - 2.5 kW; everything else together - 900 W. Decide on the numbers of hours each of these appliances is used. . Calculate the number of units for each appliance by multiplying the power of each appliance in kilowatt (kW) by the time it is used in hours per day. . Add the number of units for each to obtain the total number of units used per day. . Multiply the number of units per day by 30 to obtain the number of units used per month. • Multiply the total number of units by $0.10 (10 cents) to obtain your electricity bill for the month. 1. Use these values to complete the following table. Name of the appliance power in k amer of how sed per day Name of its whes Total number of units per day =

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Answer 1

Name of Applianles No. 9 homs Numbor of unts Kwh Penek n Kw Cost per unt uved per day -4ount 1 briquatos 0-8*24= 19-2 24 0.8 2y 3 wal heal I-7 0.7 1 1 Elechrk an 1 Cooking name 4 aiv (mditio 2 R2=2.4 1-2 2 5xlo 2S o 0-8 Rest మ g have pud eue aopp liances each Categoryne Roqui nement.Naumbes of hos used per day is as pea gennally used pun day 2) Cam ta ke more than gn u pe To tal Nember ef unit per day 14.2 +6 +o.7 +2.4 +25+l6 = 63.3 unitda 63-3x301899 unsts 3 Totul Nunbn of enits used na month 1899x 0.1-189.9 Tota Cest Ne Cam edue f consumptm by Switching Ft Some o atpliances for Seme me evrday can sejtch off lafrigeratur fo halt of me Cam not opnate walor healr Air Condi tioner we can alo be Rebt 8fffo some hms baically Ensumphm can be educed y hednciny pnatn hme of oppliances