Electricity Test Cards Chapter 12

Direct currunt is a currunt in which charged particles travel through a circuit in one direction.

Alternating currunt is a current in which electrons move back and forth in a circuit.

A transformer is an electric device that changes the size of the potential difference of an alterning currunt.

A circuit breaker is a saftey device that is placed in series with other circuits that lead to appliances and outlets.

A fuse is a saftey device that is found in older buildings and some appliances like a circuit breaker it is placed in series with other circuits that lead to appliances and outlets,

Electrical power is the rate in which an appliance uses electrical energy.

A watt is a unit of electrical power 1kilowatt = 1000W

• A kilowatt is a practical unit of electrical power.
• 1kW=1000W

This is 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.

This is the practical unit of electrical energy.

This is a label that gives details about how much energy an appliance uses in one year of normal use.

A smart meter is a meter that records the total electrical energy used hour by hour and sends the information to the utility company automatically.

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

A phantom load is the electricity that is consoumed by an appliance or device when it is turned of.

Efficiency is the ratio of usefull energy output to total energy input, expressed as a percentage.

A base load is the continous minimum demand for electrical power.

This is the production of electricity using a source of moving water.

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

A peak load is the greatest demand for electricity which is met by using natural gas and hydroelectic power.

This is a source of energy that can be replaced in a relativily short time.

This is a source of energy that cannot be replaced as fast as it is being used.

This is energy that is directly converted from the enrgy of the sun into electricity.

This is the generation of a direct currunt when certin materials are exposed to light.

This is a renewable energy source it is a biological material from living, or recently living organisms.