Maria | Manga CH. 1

1.  Microwave                    |    Wattage: 1560 W  Amp: 13 A    Volts: 120 V
                                            Cost(kWh): 15min use/24 hr = 15min use/60 min = 0.25 kWh * 1560 W =    
                                                                0.390 kWh * $0.121 =  approx. $0.5/day

2.  Hair Dryer                     |    Wattage: 1800 W  Amp: 15 A     Volts: 120 V
                                            Cost(kWh): 15 min use/24 hr = 0.25 kWh * 1800 W = 0.450 kWh *            
                                                                $0.121 = approx. $0.6/day

3.  T.V.                                |     Wattage: 600 W   Amp:  5 A       Volts: 120 V
                                            Cost(kWh): 180 min use/24 hr = 3 kWh * 600 W = 1.8 kWh * $0.121 =
                                                                 approx. $0.22/day

4.  Stove (med. burner)     |     Wattage: 1500 W  Amp: 6.25 A    Volts: 240 V
                                           Cost(kWh): 120 min use/24hr = 2 kWh * 1500 W = 3.0 kWh * $0.121 =
                                                               approx. $0.36/day

5.  Water Heater                 |    Wattage: 4500 W   Amp: 18.75 A  Volts:  240 V
                                            Cost(kWh): 150 min use/24 hr = 2.5 kWh * 4500 W = 11.250 kWh *
                                                                $0.121 = $1.36/day

I can plug two appliances into one outlet with a 20 Amps breaker; the hairdryer and the TV without tripping the breaker. Hairdryer (15A) + TV (5A) = 20 A. I cannot plug the hairdryer with the microwave because it will trip the breaker. Hairdryer (15A) + Microwave (13 A) = 28 A. I cannot include the stove and water heater because of the voltage differences are not compatible.

I used the Energy Use Tier I and Electric Fuel Adjustment for the calculations. GRU total charge without taxes and fees is approx. $0.121 kWh.

Also, I found out that older appliances consume more electricity than the rated label. I should consider changing to newer energy-efficient models. All of this is based off my November Electric Bill (11/30/2015). Average Electric Daily Consumption is $11.03. The total approximation of costs for the appliances listed above is $3.04. $11.03 - $3.04 = $7.99 approx. the cost of the other appliances used at home that are not listed above.

I found out that electric appliances are divided by two types: Resistive run and Motor run appliances.
Resistive run appliances consume the same amount of electricity from the time of start until stop of use. Motor run appliances depending on the configuration from the very first few seconds can consume 2.5 up to 5 times the rated consumption.


Read pages 1-36 in Tha Manga Giude to Electricity and post questions to blog.
Calculate how much it costs to use five common appliances that you use every day in your home for 24 hours. Please let me know the applicance, its wattage, amps and volts of each appliance and how you calculated cost. You will need to go to GRU or look at one of your electric bills.

How many of those appliances can you plug into one outlet without tripping a breaker? Please do this mathematically rather than through direct experience.