# Science Unit Test Chapter 12 Glossary Terms

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The flashcards below were created by user Jlawrence on FreezingBlue Flashcards.

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

There are step-up and step-down transformers; step-ups increase potential difference, and step-downs decrease potential difference
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 kW= 1000 W
8. Kilowatt:
A practical unit of electrical power; 1 kW= 1000 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 the appliance is used
10. Kilowatt-hour (kW*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 in which the cost of each kW*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
• i.e. water spinning turbines by moving through the turbines
A demand for electricity that is greater than base load that 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
• i.e. solar, wind, geothermal, hydro, tidal, ocean wave, biofuel
21. Non-renewable Energy Source:
• A source of energy that cannot be replaced as quickly as it is used
• i.e. coal, natural gas, oil, nuclear power
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

## Card Set Information

 Author: Jlawrence ID: 288015 Filename: Science Unit Test Chapter 12 Glossary Terms Updated: 2014-11-04 11:22:25 Tags: Science Physics Electricity Chapter12 Folders: Description: Glossary terms for chapter 12 Show Answers:

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