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The flashcards below were created by user
lharttrup
on FreezingBlue Flashcards.
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what is direct current (DC)?
a current in which charged particles travel through a circuit in only one direction
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what is alternating current (AC)?
a current in which electrons move back and forth in a circuit
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what is a transformer?
an electrical device that changes the size of the potential difference of an alternating current
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what is a circuit breaker?
a safety device that is placed in series with other circuits, which lead to appliances and outlets
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whats a 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 whcih lead to appliances and outlets
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what is electrical power?
the rate at which an appliance uses electrical energy
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what is a watt (w)?
a unit of electrical power
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what is a kilowatt (kW)?
- a practuical unit of electrical power;
- 1kW= 1000 W
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what is electrical energy?
the energy that is used by an appliance at a given setting; determined by multiplying the power rating of an appliance by the lenght of time it was used
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what is a kilowatt hour (kW.h)?
the practical unit of electrical energy
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what is an EnerGuide label?
a label that gives details about how much energy and appliance uses in a normal year of use
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what is a smart meter?
a meter that records the total electrical energy used hour by hour and sends this information to the utlility company automatically
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what is time of use pricing?
a system of pricing in whcih the cost of each kW.h of energy used is different at different times of the day
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what is a phantom load?
the electricity that is consumed by an appliance or device when it is turned off
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what is efficiency?
- the ration of useful energy output to toatl energy input, expressed as a percentage.
- percent efficiency= useful energy output
- total energy input x 100
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what is a base load?
the continuous minmum demand for electrical power
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what is hydroelectric power generation?
the generation of electrical power useing a source of moving water
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what is a renewable energy source?
a source fo energy that an be replaced in a relatively short period of time
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what is a non-renewable energy source?
a source of energy that cannot be replaced as quickly as it is used
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what is an intermediate load?
a demand for electricity that is greater than the base load and is met by burning coal and natural gas
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what is a peak load?
the greatese demand for electricity, whcih is met by using hydroelectric power and natural gas
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what is solar energy?
energy that is directly converted from the sun into electricity
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what is photovoltaic effect?
the generation of a direct current when certain materials are turned to light
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what is biomass energy?
energy that is generated from plant and animal matter
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