# Science- Unit 2 Electricity chapter 12

The flashcards below were created by user McKaelaC 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
4. Circuit breaker
a safety divice 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 applainces; 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; 1 kW = 1000W
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.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. Effciency
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
18. Renewable energy source
a source of energy that can be replaced in a relatively short period of time
19. non-renewable energy
a source of energy that cannot be replaced as quickly as it is used