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