The impact of small values on the environment

Electrical consumption by an appliance = Power rating of the appliance (in Watts)  x  time used (in Hours)

Cost of using an appliance = Power rating of the appliance (Watts)  x  Time used (Hours)

Cellphone charger using 4,5 Watts/Hour for 3 hours to charge a cellphone.

Electricity consumption:  =  4,5 watts/hour  x 3 ÷ 1 000 (Convert from Watts to kW)

                                  =  4,5 x  3 ÷ 1 000 

                                  =  0,0135 kWh  ═►  

Estimated tarriff:  R0,48/kWh

Cost  = 0,0135 kWh  x  R0,48/kWh   =   R0,00648  (Less than ½ cent per day)

Electricity consumption in stand-by mode:

Consumption  =  1,5 Watts/hour  x  (24  -  3)h  ÷ 1 000   =   0,0315kWh  ═►

Cost  = 0,0315 kWh  x  R0,48/kWh   =   R 0,01512  (More than 1½ cent per day) 

                                 =   R 5,40 per year ═►

36,2 million cellphone users in South Africa  36,2 million  x  0,0315 kWh  x  365 days 

                                                                    =  416 209 500 kWh of wasted electricity

South Africans consume approximately 218 120 GWh  -  Annually

17%  -  Domestic Consumption  =  17%  x   218 120 GWh   =  37 080 GWh

1 GWh  =  1 000 000 kWh

Cellphone chargers account for:  416 209 500 kWh / 37 080 400 000 kWh  =  1% of Domestic Consumption

The production of 1 kWh of electricity:

• Consumes 0,49 kg of coal;
• Comsumes 1,2 litres of water; and
• Produces 966 g of Carbon Dioxide (CO2)

Carbon dioxide is a key contributor to Global Warming

90% of all Electricity is produced from coal  90%  of the wasted 416 209 500 kWh  =  374 588 550 kWh ═►

That is:  @ 0,49kg/kWh ═►

183 548 tons of coal being used  @ 1,2 lt/kWh  ═►

449 506 260 litres of water being wasted  @ 966 g /kWh ═►

361 852 tons of CO2 (Carbon dioxide) is pumped into the air    ═►   Contributing to Global Warming

                                                                                 Wasted Electrical Power 

Appliances           Max Stand-by Power (W)       Min Stand-by Power (W)           Ave Stand-by Power (W) 

Mobile phone charger         3                                                         1                                                                   1,5

Kitchen Oven                       18                                                        6                                                                   11,1 

Personal Computer            27                                                         1                                                                   6,9 

Television                             22                                                         1                                                                   4,5 

Video Recorder  (VCR)     30                                                          1                                                                   7,2 

Hi-Fi Stereo                         24                                                          1                                                                   5,5 

Doorbell                               1,5                                                          1                                                                   1,1

Legend:

W = Watts     Max = Maximum     Min  =  Minimum       Ave  =  Average    

Something to ponder about and maybe to think about not wasting electicity daily.