Electrical Circuits

Conductors have ____or fewer valence electrons

Three

The outermost ring of electrons orbiting the nucleus of an atom is known as the ____

Valence Shell

The change in voltage across a component is called a____

Voltage drop

The basic unit of measurement for electrical power is the ____

Watt

Which of the following is considered an insulator

a. Gold b. Copper c. Silver D. Porcelain

Current is measured in units called ____

amperes

Another term used for voltage is ____

emf

In a parallel circuit, the total resistance is ____ the smallest resistance.

less than

Circuit continuity is checked using the ___ function of a multimeter.

ohmmeter

A device containing one or more coils of wire wrapped around a common core is call a____

transformer

Joules are___

units of work

The ___ is the smallest particle of an element that will still retain the properties of that element

Atom

Consisting of two or more cells, ____ convert chemical energy into electrical energy.

Batteries

Electric charge is measured in

Coulombs

Ammeters measure

Current

To find voltage when both current and resistance are known, use the formula ___

E=IxR

An ____is a negatively charged particle that orbits the nucleus of an atom

Electron

The sum of the difference in potential of all the charges in an electrostatic field is called ____

(EMF)Electromotive Force or Voltage

Find the resistance when the voltage is 120v and the current is 6A

20 ohm; R=E/I; 120 / 6 = 20

The voltage commonly supplied to a residence by the local utility is ____

240 Volts

A resistor with a color code of yellow, orange, red, and silver has a tolerance of

3870 - 4730 ohms

The color band that represents tolerance on a resistor is the ____

4th band

The power in a circuit with 120 volts and 5 amps is ____

600 volts; 120 X 5; P=IE

An electrical circuit contains, at a minimum

A voltage source, a load, and conductors to carry the electrical current

An ___ is a material through which it is difficult to conduct an electric current

Insulator

The prefix used to indicate one thousand is ____

Kilo

____ is any substance that has mass and occupies space.

Matter

The prefix used to indicate one million is___

Mega

The ____ is the center of an atom

Nucleus

Resistance is measured in

Ohms

_____ is a statement of the relationship between current, voltage, and resistance in an electrical circuit.

Ohms law

____ is the rate of doing work or the rage at which energy is used or dissipated

Power

A type of subatomic particle with a positive charge is a(n) ____

Proton

The charged particles of an atom are called

Protons and Electrons

Found in the nuclei of atoms, ____ are electrically positive particles and ____ are electrically neutral particles

Protons; Neutrons

A ____ is an electro-mechanical component used as a switching device

Relay

A ___ is a component that normally opposes current flow in a DC circuit

Resistor

a ____ is a drawing in which symbols are used to represent the components in a system

Schematic

A ____circuit has only one route for current flow

Series

An electromagnetic device used to control a mechanical device such as a valve is called a_____

Solenoid

All conductors have ___

Some resistance