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Energy Consumption of Domestic Appliances

Power Demand and Energy Consumption of Domestic Appliances

Appliance Type Appliances Power Rating (WATT) Appliances Rated current Number of hrs to consume 1 unit (1kwh) of electricity WITH R2SP (SINGLE PHASE RESIDENTIAL) TARIFF OF N21.30/KWH WITH C1SP (SINGLE PHASE COMMERCIAL) TARIFF OF N27.20/KWH WITH C2 (HIGHER LEVEL COMMERCIAL) TARIFF OF N37.74/KWH
(Watts) (Amperes) (Hours) COST OF CONSUMPTION IN 1HOUR (N : K)
Pressing Iron Dry Iron 1200 5.22 0.83 25.56 32.64 45.29
Pressing Iron Steam Iron 2000 8.70 0.50 42.60 54.40 75.48
Toaster Small 750 3.26 1.33 15.98 20.40 28.31
Toaster Medium 1000 4.35 1.00 21.30 27.20 37.74
Toaster Large 1400 6.09 0.71 29.82 38.08 52.84
Kettle Small 1850 8.04 0.54 39.41 50.32 69.82
Kettle Medium 2200 9.57 0.45 46.86 59.84 83.03
Blender Medium 450 1.96 2.22 9.59 12.24 16.98
Microwave Medium 900 3.91 1.11 19.17 24.48 33.97
Water Dispenser Normal (Common) 700 3.04 1.43 14.91 19.04 26.42
Water Heater 50 litre 1500 6.52 0.67 31.95 40.80 56.61
Water Heater 100 litre 3000 13.04 0.33 63.90 81.60 113.22
Cooker 1 Plate 1500 6.52 0.67 31.95 40.80 56.61
Cooker 2 Plate 2500 10.87 0.40 53.25 68.00 94.35
Cooker 4 Plate 4500 19.57 0.22 95.85 122.40 169.83
Cooker 2 Plate + Oven 3300 14.35 0.30 70.29 89.76 124.54
Fan Table 40 0.17 25.00 0.85 1.09 1.51
Fan Standing 70 0.30 14.29 1.49 1.90 2.64
Fan Ceiling 85 0.37 11.76 1.81 2.31 3.21
Refrigerator Small 80 0.35 12.50 1.70 2.18 3.02
Refrigerator Medium 100 0.43 10.00 2.13 2.72 3.77
Refrigerator Large 140 0.61 7.14 2.98 3.81 5.28
Air-Conditioner Small (1HP) 746 3.24 1.34 15.89 20.29 28.15
Air-Conditioner Small (1.5HP) 1119 4.87 0.89 23.83 30.44 42.23
Air-Conditioner Medium (2HP) 1492 6.49 0.67 31.78 40.58 56.31
Air-Conditioner Large (4HP) 2984 12.97 0.34 63.56 81.16 112.62
Television 100 0.43 10.00 2.13 2.72 3.77
Television 300 1.30 3.33 6.39 8.16 11.32
Water Pump Small (1HP) 746 3.24 1.34 15.89 20.29 28.15
Water Pump Medium(1.5HP) 1119 4.87 0.89 23.83 30.44 42.23
Washing Machine With spinning 600 2.61 1.67 12.78 16.32 22.64
Washing Machine With spinning, dryer & OTHERS 2100 9.13 0.48 44.73 57.12 79.25
Lighting Bulb – Tungsten Filament 60 0.26 16.67 1.28 1.63 2.26
Lighting Bulb -Energy Saving 15 0.07 66.67 0.32 0.41 0.57

IMPORTANT NOTE : THE LAST THREE COLUMNS INDICATE THE COST OF ELECTRICITY THAT WILL BE CONSUMED IN 1HOUR BY EACH OF ALL THE APPLIANCES LISTED, AT THREE DIFFERENT CUSTOMER-TARIFFS, WITH A TARIFF EACH EXPRESSED IN EACH OF THE THREE COLUMNS.         The basic unit of electricity is the KilowattHour (KWH). In simple terms, 1 kwh (=1000wh) is the amount of energy used by an electrical appliance rated 1kw (=1000 watt, e.g. a 1000watt electric heater) used for 1 hour. Another example is ten 100-watt light bulbs used for 1 hour. This means that such electrical appliance/s used for 30 minutes will consume half unit because 1hour consumption gives 1000Wh (=1KWh). Therefore If used for 2 hours, same appliance will consume double unit

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