SNC 3E – Unit #2 Electricity
Chapter 4.1 Consumers and Electrical Devices
· AC vs. DC Current
- some devices a. are plugged into an AC outlet
(e.g. appliances)
b. have adapters to convert AC to DC
(e.g. flashlights)
· Measuring Electricity Use
- measure energ y in J oules (J)
- Electric Powe r is what we measure our energy use in because joules are too small, measured in Watts (W) or Ki lowatts (kW)
- To find out how much energy we use…
Powe r x time = energy used
(kilowatt hours) 1000 watts/hour
· Major Appliances and Energy Efficiency
- energy efficient appliances don’t waste energy
(e.g. efficient light bulb produces light and not much heat )
- major appliances in Canada have to
a. meet minimum energy efficiency standards
b. have to have an EnerGuide label
- EnerGuide labels tell you…
a. amount of energy used in a year by appliance
b. energy consumption compared to similar appliances
· The Need for Regulation
- electrical devices require approved logos on them because most electrical devices draw at least 1 A of (which is enough to kill a )
- 4 different organizations have been approved by the government
· Canadian Standards Association
- associations goal is to develop a set of standards that address’ issues like improving public safety and health
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