Glossary terms chapter 12
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Glossary terms chapter 12
glossary terms chapter 12
grade 9 science textbook chapter 12 glossary terms
Direct current (DC)
Current in which charged particles travel through a circuit in only one direction.
Electrons move from negative to positive terminal.
Alternating current (AC)
Current in which electrons move back and forth in a circuit.
An electrical device that changes the size of the potential difference of an alternating current.
Do not work with direct current.
A safety device that is placed in series with other circuits, which lead to appliances and outlets.
A safety device that is found in older buildings and some appliances; like a circuit breaker it is placed in series with other circuits, which lead to appliances and outlets.
The rate at which an appliance uses electrical energy.
A unit of electrical power.
A practical unit of electrical power.
1 kW = 1000 W
The energy that is used by an appliance at a given setting; is determined by multiplying its power rating by the length of time it is used.
Energy = rate x time
The practical unit of electrical energy.
A label thhat gives details about how much energy an appliance use in one year of normal use.
A meter that records the total electrical energy used hour by hour and sends this information to the utility company automatically.
Time of use pricing
A system of pricing in which the cost of each kWh of energy used is different at different times of the day.
It is broken down into off-peak, mid-peak, and on-peak times for pricing.
The electricity that is consumed by an appliance or device when it is turned off
ex. a radio that is turned off, but left plugged in all day, will still consume energy.
the easiest way
The ratio of useful energy output, to total energy input, expressed as a percentage.
energy input is its power multiplied by the time it is on.
Percent efficiency = Eout/Ein x 100
The continuous minimum demand for electrical power.
The minimum amount of electrical power needed in ontario is 12 000 MW.
1 MW = 10
Base load is generated mainly by hydroelectric and nuclear generating stations.
Hydroelectric power generation
The generation of electrical power using a source of moving water
ex. niagra falls
A demand for electricity that is greater than the base load and is met by burning coals and natural gasses.
The greatest demand for electricity which is met by using hydroelectric power and natural gas
Renewable energy source
A source of energy that can be replaced in a relitively brief period of time.
eg. solar energy
Non-renewable energy source
A source of energy that can not be replaced as quickly as it is used.
Energy that is directly converted from the energy of the sun into electricity.
eg. solar pannels
The generation of a direct current when certain materials are exposed to light
Biomass Energy is defined by any organic materials that can be burned and used as a source of fuel.
ex. wood, (manure = biogas)