# Electricity Chapter 12

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1. Direct Current (DC)
Current in which charged particles travel through a circuit in only one direction.
2. Alternating Current (AC)
Current in which electrons move back and forth in a circuit.
3. Transformer
An electrical device that changes the size of the potential difference of an alternating current.
4. Circuit Breaker
A safety device that is placed in series with other circuits, which lead to appliances and outlets.
5. Fuse
A safety device that is found in older buildings and some appliances; like a circuit breaker, it is placed in series with other circuits, which lead to appliances and outlets.
6. Electrical Power
The rate at which an appliance uses electrical energy.
7. Watt (W)
A unit of electrical power.
8. Kilowatt (kW)
• A practical unit of electrical power.
• E.g. 1 kW = 1000 W
9. Electrical Energy
The energy that is used by an appliance at a given setting; determined by multiplying the power rating of an appliance by the length of time it is used.
10. Kilowatt-hour (kW x h)
The practical unit of electrical energy.
11. EnerGuide Label
A label that gives details about how much energy an appliance uses in one year of normal use.
12. Smart Meter
A meter that records the total electrical energy used hour by hour and sends this information to the utility company automatically.
13. Time of Use Pricing
A system of pricing which the cost of each kW x h of energy used is different at different times of the day.
The electricity that is consumed by an appliance or device when it is turned off.
15. Efficiency
The ratio of useful energy output to total energy input, expressed as a percentage.
The continuous minimum demand for electrical power.
17. Hydroelectric Power Generation
The generation of electrical power using a source of moving water.
A demand for electricity that is greater than the base load and is met by burning coal and natural gas.
The greatest demand for electricity, which is met by using hydroelectric power and natural gas.
20. Renewable Energy Source
• A source of energy that can be replaced in a relatively short period of time.
• E.g. Wind and solar energy.
21. Non-Renewable Energy Source
• A source of energy that cannot be replaced as quickly as it is used.
• E.g. Coal, natural gas, fossil fuels.
22. Solar Energy
Energy that is directly converted from the Sun into electricity.
23. Photovoltaic Effect
The generation of a direct current when certain materials are exposed to light.
24. Biomass Energy
Energy that is generated from plant and animal matter.
 Author: laurenschmalz ID: 245044 Card Set: Electricity Chapter 12 Updated: 2013-11-05 03:15:32 Tags: laurenschmalz Folders: Description: laurenschmalz Show Answers: