# Chapter 12

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 Author: mark_bunjac ID: 245061 Filename: Chapter 12 Updated: 2013-11-04 21:15:15 Tags: Folders: Description: Science chapter 12 Show Answers:

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1. Direct current (DC)
Current in which charged particles travel through a circuit in only one direction

2. Alternating current (AC)
• A current in which the 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 device that is placed in series with the other circuits that lead to appliances and other 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 other outletsÂ

6. Electrical power
The rate at which an appliance uses electrical energy

7. Watt (W)
A unit of electrical power; 1 kilowatt = 1000 W

8. Kilowatt (kW)
The 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 determine by multiplying its power rating by the length of time it is used

10. Kilowatt-hour (kWâˆ™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

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

13. Time of use pricing
A system of pricing in which the cost of each kWâ‹…h of energy used is different at different times
The electricity that is consumed by an appliance or device when it is turned off

E.g. Digital video recorders, Computer, Chargers for phones and electronics

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