Electricity Chapter 12

a current in which charged particles travel through a circuit in only one direction

a 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

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 whcih lead to appliances and outlets

the rate at which an appliance uses electrical energy

a unit of electrical power

• a practuical unit of electrical power;
• 1kW= 1000 W

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

the practical unit of electrical energy

a label that gives details about how much energy and appliance uses in a normal year of use

a meter that records the total electrical energy used hour by hour and sends this information to the utlility company automatically

a system of pricing in whcih the cost of each kW.h of energy used is different at different times of the day

the electricity that is consumed by an appliance or device when it is turned off

• the ration of useful energy output to toatl energy input, expressed as a percentage.
• percent efficiency= useful energy output
•                             total energy input   x 100

the continuous minmum demand for electrical power

the generation of electrical power useing a source of moving water

a source fo energy that an be replaced in a relatively short period of time

a source of energy that cannot be replaced as quickly as it is used

a demand for electricity that is greater than the base load and is met by burning coal and natural gas

the greatese demand for electricity, whcih is met by using hydroelectric power and natural gas

energy that is directly converted from the sun into electricity

the generation of a direct current when certain materials are turned to light

energy that is generated from plant and animal matter