# Electricity- Chapter 12

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1. Direct current
Current in which charged particles travel through a circuit in only one direction
2. Alternating current
A 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
4. Circuit breaker
A 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 houses and some appliances, like a circuit breaker, it is placed in series with other circuits that lead to appliances and other outlets
6. Electrical power
The rate at which an electrical appliance uses electrical energy
7. Watt (w)
• A unit of electrical power
• 1 kilowatt=1000 W
8. Kilowatt (kW)
• A practical unit of electrical energy
• 1 kilowatt=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 used
10. Kilowatt hour
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 record the total electrical energy used hour by hour and sends this info 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 used by an appliance when it is turned off
15. Efficiency
The ratio of useful energy output to the 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 water
A demand for electricity that is greater than the base load and is met by burning coal and natural gas