For centuries humankind has used the earth’s resources as if there were no tomorrow. Global energy use has risen by almost 70% during the last 30 years. What’s more, energy use is predicted to increase by 2% every year for the next 15 years.
In developed countries, about 35% of all electricity is used to run homes (more then 40% if you consider also the energy used to build them):
In general, schools spend approximately 45% of their energy use on lighting, and 15% on appliances such as computers, televisions, videos etc. The energy-saving ideas you use at home (see: following pages) can also be applied at school.
- 60% - air conditioning/heating system
- 16% - water heater
- 12% - refrigerator
- 7% - lights
- 5% - computers, TV, etc.
Energy consumption by stand-by appliances…
Home electronics and small household appliances (such as televisions (TVs), video cassette recorders (VCRs), telephone answering machines, cordless phones, portable power tools, office equipment, etc.) draw energy not only when they are in use, but also when the power is ostensibly off. This phenomenon is known as ‘leaking electricity’:
Overall, remember! Energy-efficient appliances use 25% less energy than ordinary ones…
- taking the average household electricity consumption as 3,880 kWh per year this indicates that standby power is responsible for 13% of home power consumption, according to a British survey;
- leaking electricity is responsible for an estimated 45 billion kilowatt-hours (kWh) of electricity consumed by US households each year - nearly 5% of total residential electricity use - and costs US consumers more than US$3.5 billion annually.