AS review UNIT 2 Electrical Principles and Electrical circuits/OHM'S Law

Current

What is the prime factor of electrical shock?

Ion

An atom that has lost electrons becomes an unbalanced atom called an _____

Electromotive Force (EMF)

has the ability to make electrons move

Volt

The unit of measurement for electromotive force. (symbol=V)

current

the drift or flow of electrons through a conductor. (symbol= I)

ampere

the unit of measurement of current (symbol=A)

resistance

the property of an electrical circuit that opposes the flow of electrons (symbol= R)

ohm

the unit of measurement of resistance (symbol= omega symbol)

conductor

a material that offers little opposition to the flow of electrons

Gold, silver, copper

what are the three types of conductors?

insulator

a material which prevents the undesired flow of electrons (resist)

Dry air, bakelite, mica, hard rubber, oil, plastic, and ceramic

What are the 7 insulators?

voltage source

where the usable electromotive force is product (car battery)

friction, pressure, heat, light, chemical action, and magnetism

6 types of voltage sources

magnetism

an invisible force that has the ability to attract ferrous metals, such as iron, steel, nickel, and cobalt. (electromagnetic induction:)

natural magnet and artificial magnet

what are the two sources of magnets?

artificial magnets

what magnet is usually classified as permanent or temporary magnets?

magnetic field

space surrounding a magnet where the magnetic force is felt

line or force

lines used to illustrate and describe the pattern of the magnetic force

travel from North Pole, through space, and enter the South Pole, continuous will form a closed loop, never cross each other, travel in parallel, repel each other, pass through all materials, magnetic or not, enter and leave a magnetic material at right angles.

what five things describes the magnetic force?

Place, direct, and stroke

what are the three methods of inducing magnetism?

Electromagnetism

magnetism produced by passing an electrical current through a conductor

magnetic field

all conductors carrying and electrical current have a _____ around them

magnetic poles

if a conductor is formed into a loop, known as coils or turns, magnetic poles are created

number of turns of the conductor in the coil, amount of current flow through the coil, and type of core material

strength of an electromagnet is determine by the following methods:

Electromagnetic induction

production of a voltage in a conductor because of a change in the number of magnetic lines of force passing through the conductor

conductor, magnetic field, and relative motion

(last electrical principles question) what are the three factors needed:

basic circuit

a complete path of electrical current flow of a voltage source, conductor, and a load

voltage source

a device that furnishes the electrical energy used by the load

direct current

current that flows in a constant direction

alternating current

current that flows with alternative polarity

conductor

a path for current to flow

load

a device through which current flows that changes energy into a more useful form.

voltage potential

is applied from the voltage source (+), along the conductor and load, back to the ground

basic operation

current flows from a negative point (-), through conductor and load, back to voltage source (+)

polarity

which the direction of current can be determined

open circuit

electrically separated so that current cannot flow

closed circuit

electrically joined so that current may flow

short circuit

an unintentional current path between two comments in a circuit or between a component and ground

series circuit

a circuit that contains only ONE path for current flow

series/parallel circuit

a circuit having both series and parallel characteristics

control circuit

a circuit used to control another circuit by use of an electrical or electronic device

circuit being controlled

a circuit being affected by a control circuit

the relationship of voltage, current, and resistance in an electrical circuit

if voltage increase current will also increase if resistance is kept at a constant

if resistance increases current will dec

what are the three major ohm's law?

E=IxR, or I=E/R or R=E/I

mathematical formula for OHMs

power

the rate at which work is being done

E=IxR, or I=E/R, or R=E/I

mathematical formula for ohm's law

P=IxE, or I=P/E, or E=P/I

mathematical formula for power