Chapter 10 Flashcards
the field force exerted by electrical charges .may be repulsive of attractive depending on the kinds of charges inteacting
2.electrostatic force
all electrical phenomena relating to stationary electrical charges and the forces they exert
- static electricity
law stating that like electrical charges repel and unlike charges attract
3.law of charges
SI derived unit of electrical charge equivalent to the charge of 6.24x10^18 electrons and protons
4.Coulomb (C)
imaginary lines used to model electric and magnetic fields .density and direction represent the strength and direction of the field force at any point in the field
5.lines of force
creation of a charged region on a neutral object exposed to a nearby electrical charge
6.electrical induction
object or particle with two electrical or magnetic poles of opposite nature
7.dipole
instrument that can detect electrical charge
8.electroscope
material through heat and electricity easily flow .good conductors are materials that contain mobile,electrons,most are metals
- electrical conductor
material that does not easily conduct thermal energy or electricity
- electrical insulator
material that allows limited electron flow
- Semiconductor
loss of static charge on an object
- electrical discharge
metal rod attached to the highest point of a building designed to conduct a lightning discharge safely through cables to the ground ;protecting the building from damage
- lightning rod
early charge - storage device that consisted of a jar lined and coated with lead and that use electrical induction
- Leyden Jar
modern charge - storage device used in electrical and electronic curcuits of two or more conductive plates separated by an insulator
- capacitor
continuous flow of electrical charges
16.electrical current
hollow,vaccum filled glass device containing electrical plates with opposite charges
17.cathode
energy or work that can be done by charges moving between two points of different voltages
18.electrical potential energy
flow of positive charges through a conductor or electrolystic solution
19.conventional current
electrical current that flows in only one direction
20.direct current
complete path for an electrical current
21.electrical current
only device that purposely converts electrical energy to another form of energy in an electrical circuit
22.electrical load
device that opens or closes a gap in an electrical circuit to control the flow of current
23.switch
source of electrical potential consisting of one or more voltaic cells
24.battery
device that creates an electrical potential by either releasing electrons through chemical reaction
25.electrochemical cell
amount of work required to move a unit charge between two points in a curcuit
26.volt
SI unit base unit of electrical current defined as IA = IC/S
27.ampere
property of all electrical curcuit elements that impedes the flow of current to some extent
28.electrical resistance
electrical circuit component whose specific purpose is to impede current flow
29.resistor
law stating that in a DC circuit component of resistance R ,the current through the component is directly proportional
30.Ohm’s law
unit of elctrical energy used by utilities
31.Kilowatt hour
SI unit of electrical resistance
32.ohm
electrical circuit of a circuit with single path of current flow through a connected set of electrical
33.series circuit
electrical circuit of a circuit with multiple parallel path
34.parallel circuit
location in an electrical circuit with a single path of curreny flow
35.short circuit
electrical device designed to open the circuit
36.overcurrent protection
reusable overcurrent protection device that opens a switch
37.circuit breaker
reusable overcurrent protection device that opens a switch when pulsing ,high-current conditions
38.arc-fault interrupter
protection device that breaks a circuit ,conductor strip melts
39.fuse
fault circuit interrupter electrical device that opens when it senses a path for the current to ground exists
40.ground - fault circuit
