# Electricity Chapter 12

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1. Direct Current (DC)
Current from a cell in which charged particles move from the negative terminal to the positive one.
2. Alternating Current (AC)
• Moving a magnet in and out of a coil of wire generates a current in the coil
• The current moves one way when a pole of the magnet is inserted into the coil and the opposite direction when the magnet is removed from the coil
• Electrons moving back and forth with no net direction
3. Transformer
• A simple electrical device that can change the potential difference of an AC
• Do not work with DC
• Can reduce the V of increase the V
4. Circuit Breaker
A safety device that is put in series with other circuits that lead to appliances and outlets
5. Fuse
A safety device in older buildings/ appliances; like a circuit breaker, it is placed in series with other circuits and leads to appliances and outlets.
6. Electrical Power
The rate at which a device uses electrical energy.
7. Watt (W)
The measurement for electrical power.
8. Kilowatt (KW)
1000W
9. Electrical Energy
The energy that is used by a device at a given setting.
10. Kilowatt-hour
Measurement for electrical energy.
11. Energuide Lable
A label that gives details about how much energy in an appliance is used over one year of normal use.
12. Smart Meter
• A meter that records the total amount of electrical energy used hour by hour
• Automatically sends info to utility companies
13. Time of Use Pricing
A system of pricing in which the cost of each KWh energy used is different at different times in a day.
• The electrical energy that is consumed while a device is not turned onĀ
• Best way to prevent it is to unplug the device
15. Efficiency
• The ratio of useful energy output to total energy input
• Energy input id the power multiplied by time appliance is on
• The continuous minimum demand for electrical power
• Ontario = 12 000W
• In Ontario is is primarily generated using hydroelectric and nuclear power
17. Hydroelectric Power
The production of electricity using a source of running water.
• A demand for electricity higher than the base load
• Met by burning coal and natural gasses
The greatest demand for electricity.
20. Renewable Energy Source
• Energy that can be renewed in a relatively short amount of time
• Eg. hydroelectrical power
21. Non-Renewable Energy Source
• Energy that cannot be renewed as quickly
• Eg. fossil fuels
22. Solar Energy
• Positives - renewable, environmentally friendly, at 100% efficiency 1 m2 can supply power for most electrical appliances
• Negatives - most only work at 25% efficiency, not concentrated, high cost, require sunlight which isn't always present
23. Photovoltaic Effect
The generation of a DC when certain materials are exposed to light.
24. Biomass Energy
• Positives - only returns as much carbon to the atmosphere as was originally in the organism (neutral), results in less acid rain, no heavy metals emitted, renewable
• Negatives - resources to burn aren't very available

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 Author: Anonymous ID: 287853 Filename: Electricity Chapter 12 Updated: 2014-11-02 14:28:43 Tags: Electricty Folders: Description: Electricity glossary terms Show Answers:

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