# glossary terms for chapter 12 grade 9 science ms day

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1. Direct Current (DC)
• Current in which charged particles in a circuit travel in only one direction. Electrons travel from the negative terminal, through the circuit, to the positive terminal
• eg. Batteries/cells use direct current to supply electrical energy
• related terms- alternating current, electrical power
2. Alternating Current (AC)
• Current in which the flow of electric charge periodically changes direction. The electrons move back and forth. There is no net movement of charge.
• eg. Power lines use alternating current.
• Related terms-direct current, electrical power
3. Transformer
• A device that is used to reduce or increase the voltage of an alternating current.
• eg. A transformer is used to decrease the voltage of electrical power before it enters your house
4. Circuit Breaker
• An automatically operated electrical switch used to protect an electrical circuit from damage caused by overload or a short circuit. Its function is to detect fault conditions and interrupt current flow
• eg. circuit breakers are used in your home to keep us safe from the dangers of electricity
5. Fuse
• A device that is used to keep us safe from the dangers of electricity. A strip of wire  melts and breaks in an electrical circuit when the current exceeds a safe level
• eg. Fuses are used in your home so that the current of an electrical circuit doesn't exceed a safe amount
6. Electrical Power
• The rate at which electric energy is transferred by an electric circuit. The unit of power is the watt.
• eg. Electric power is produced by electric generators
7. Watt (W)
• A unit of power in an electric circuit, equivalent to one joule per second.
• eg. a hair dryer uses 1200 watts
• related terms-Kilowatt, electrical energy
8. Electrical Energy
• The energy made available by the flow of electric charge through a conductor.
• eg. This wire has lots of electrical energy
9. Kilowatt-hour (kWh)
• A unit of energy equal to 1000 watt-hours.
• related terms-Kilowatt, Watt
10. EnterGuide label
• A label that shows details about the use of energy an appliance uses in one year of normal use
• eg. A fridge uses 460 kWh
11. Smart meter
• A meter that records the total electrical energy used hour by hour, and sends this information to the utility company automatically.
• eg. the smart meter recorded how much energy you used yesterday
12. Time of use pricing
• A system of pricing in which the cost of each kWh of energy used is different at different periods of the day. It is broken up into off-peak, mid-peak and on-peak pricing.
• eg. You try to use electricity at off-peak times in order to save money
• Electricity that is consumed by an electrical appliance/device even when it is turned off.
• eg. My phone's battery went down by 5% when it was turned off
14. Efficiency
• The ratio of useful energy output to total energy input shown as a percentage.
• percent efficiency=
• useful energy output/total energy input x100
• The lowest continuous demand for electrical power.
• eg.The base load for Ontario is 12 000 MW
16. Hydroelectric Power Generation
• Electricity generated by the movement of water.
• eg. Niagra falls generates hydroelectric power
• A demand for energy greater than the base load, but not as high as the peak load.
• eg. Ontarios intermediate load is met by burning coal and natural gas
• The highest demand for electricity.
• eg. Ontario's peak load is met by using hydroelectric power and natural gas
19. Renewable energy source
• An energy source that can be replaced fairly quickly or wont run out
• eg. Hydroelectric energy is a renewable energy source.
• related terms-non-renewable energy source
20. Non-renewable energy source
• An energy source that can't be replaced very quickly or will run out
• eg. Nuclear power is a non-renewable energy source
• related terms- Renewable energy source
21. Solar energy
• Radiant energy emitted by the sun
• eg. solar panels harness solar energy and convert it into electricity
22. Photovaltic effect
• The creation of voltage or electric current in a material when it is exposed to light.
• related terms-solar energy
23. Biomass energy
• The burning/processing of renewable organic materials to be used to create energy.
• eg. The wood was burned to create heat
• related terms-solar energy
 Author: noahdh0885 ID: 288059 Card Set: glossary terms for chapter 12 grade 9 science ms day Updated: 2014-11-04 02:40:47 Tags: glossary terms Folders: Description: glossary terms for science ms day Show Answers: