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.