# Chapter 12 electricity flash cards

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1. Direct current(DC)
Currernt in which charge particles travel through a circuit in only one direction
2. Alternating current(AC)
A current in which particles move back and forth in a circuit
3. Transformer
Not a robot that tries to save or destroy the earth but an electrical device that changes the size of the potential difference of an alternating current
4. Circuit breaker
A saftey device that is placed in series with other circuits that lead to appliances and outlets
5. Fuse
A saftey 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 killowatt=1000W
8. Kilowatt
A particle unit of electrical power; 1kw=1000W
9. Electrical energy
The energy that is used by an appliance at a given setting; is determinded by multiplying its power rating by lenghth of time used
10. Kilowatt-hours(kW.h)
The particle unit of electrical energy
11. EnerGuide label
A label tahat gives details about how much energy an appliance uses in one year of normal use
12. Smart meter
A meter that records he total electrical energy usedĀ  hour by hour and sends thisĀ 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 appilance or device when it is turned off
15. Efficency
The ratio of useful energy output ,expressed as a percentage
The countinuous minimum demand for electrical power
17. Hydroelectric power generator(The tounge twister)
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 fossil fuels and natural gas