# Electricity 3

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 Author: bijaldesai ID: 182345 Filename: Electricity 3 Updated: 2012-11-07 19:51:58 Tags: school Folders: Description: chapter 12 Show Answers:

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1. Direct Current (DC)
Current in which particles travel through a circuit in only one direction
2. Alternating Current (AC)
A current in which electrons move back and forth in a circuit
3. Transformer
An electric device that changes the size of the potental difference of an alternating current
4. Circuit breaker
A safety device that is placed in series with other circuits that 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 that 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
• 1 kilowatt = 1000W
8. Kilowatt (kW)
• A practical unit of electrical power
• 1kW = 100 W
9. Electrical energy
the energy that is used by an appliance at a given setting; is determined by multiplying its power rating by the length of time it is used
10. Kilowatt-hour
the practical unit of electical energy
11. EnerGuide label
A label that gives details about how much energy an appliance uses in one year of normal use

ex;

12. Smart meter
A meter that records the total electrical energy used hour by hour and sends this information to the utility company automatically

ex;
13. Time of use pricing
A system of pricing in 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 production of electricity 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 brief period of time
21. Non- renewable energy source
A source of energy that cannot be replaced as quickly as it is used
22. Solar energy
energy that is directly converted from the energy of 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

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