1.An electric circuit makes it possible to use the energy of moving electrons.
2.In a circuit, electric energy is changed into other forms of energy, such as heat, light and magnetism.
3.The four basic parts of a complete circuit are the energy source, the conductors, the load, and the control device.
4.Electromotive force causes electrons to move through a circuit.
5.Common sources of energy used in electric circuits are chemical cells and electromechanical generators.
6.The flow of electrons in a circuit is called current.
7.Electrons flow through a circuit from the negative terminal of the energy source to the positive terminal of the energy source.
8.Conductors provide a path through which electrons can move in a circuit.
9.The most common conductor material is copper.
10.The part of a circuit that changes electric energy into another form of energy is the load.
11.The series circuit provides one path through which electrons can move.
12.In a parallel circuit, there may be two or more electron paths.
13.In a series-parallel circuit, series and parallel circuits are combined.
14.A switch is an example of a circuit control device.
15.Electromotive force is measured in units called volts.
16.Current is measured in units called amperes.
17.For an electrical device to operate, an energy source must supply the voltage and the amperage that the device requires.
18.Direct current moves through a circuit in one direction only.
19.The action of a sinusoidal alternating current is best described by what is called a sine wave.
20.Examples of devices or products that can be operated with either direct or alternating current are lamps and heating elements.
21.Direct current must be used for the operation of electronic devices such as transistors and integrated circuits.
22.A rectifier circuit is one that changes alternating current into direct current.
23.Electric companies base their bills on a unit called the kilowatt-hour.
