Electricity Chapter 12
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Direct current (DC)
A type of current in which charged particles travel through a circuit in only one direction from negative to positive.
Alternating current (AC)
A type current in which the electrons move back and forth in a circuit with no net movement.
An electrical device that changes the size of the potential difference of an alternating current.
E.G Step up transformer or Step down transformer
A safety device that is placed in series with the other circuits that lead to appliances and other outlets which can break circuits.
A safety device found in older buildings similar to a circuit breaker, it is placed in series with other circuits that lead to appliances and other outlets.
The rate at which an appliance uses electrical energy.
A unit of electrical power.
E.G 1 kilowatt = 1000 W
The energy that is used by an appliance at a given setting. It is determine by multiplying its power rating by the length of time it is used for.
The practical unit of electrical energy. Used for applicances etc.
A label that gives details about how much energy an appliance uses in one year.
EG. On a refrigerator etc.
A meter that records the total electrical energy used hour by hour and sends the information to the utility company automatically. Found in newer homes.
Time of use pricing
A system of pricing in which the cost of each kW⋅h of energy used is different at different times.
The electricity that is used by a device when it is off.
EG. A computer monitor.
The ratio of useful energy output to total energy input expressed as a percentage.
The minimum demand for electrical power.
Hydroelectric power generation
A generating station which uses a source of moving water to generate AC electricity.
A demand that is slightly greater than base load and is met by burning coal and natural gas.
The highest demand for electrical energy, met by using hydro and natural gas.
Renewable energy source
A source of energy that can be replaced in a relatively brief period of time.
EG. Wind energy, solar energy
Organic materials that can be used as a source of fuel.
EG. Forest wood
Energy that is radiated from the Sun outward towards the Earth.
The generation of an electrical current when certain materials are exposed to light
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