electrical

Question 1

what is the smallest part which you can divid matter without changing its make up

Answer 1

molecule

Question 2

what are molecules made of

Answer 2

atoms

Question 3

what are 3 basic components of an atom and their electrical charges

Answer 3

nutrons no charge
protons positive charged
electrons negative charge

Question 4

what is a stationary electric charge called

Answer 4

static

Question 5

what is a moving electric charge called

Answer 5

electric current

Question 6

unlike charges ____ each other

Answer 6

attract

Question 7

like charges ___ each other

Answer 7

repel

Question 8

define magnetic flux

Answer 8

the entire magnetic field surrounding a magnet

Question 9

what are 3 principles of electromagetism

Answer 9

–moving electrically charged particles create magnetic field
–magnetic fields attract or repel moving charged particles
–moving magnetic fields near charged particles causes current flow

Question 10

what does DC mean

Answer 10

moves in one direction

Question 10

name 2 sources of direct current

Answer 10

welder
batterie

Question 10

name 2 most common semiconductor materials

Answer 10

sillicon
germanium

Question 11

name 4 uses for direct current

Answer 11

weld
operate motors
charging batteries
industrial electromagnets

Question 12

3 phase is more efficient is uses what % of less copper

Answer 12

25 percent

Question 13

how many watts in 1 hp

Answer 13

746 watts

Question 14

what is a conductor

Answer 14

material that has low resistance to current flow , copper gold silver aluminium

Question 15

what is an insulator

Answer 15

poor conductor of current ,good insulators are glass , wood , plastic ,mica

Question 16

what is a semi conductor

Answer 16

material that is neither a good insulator or good conductor

Question 17

what is a brown out

Answer 17

when lights suddenly dim and stay that way , all equipment should be shut down until problem is fixed

Question 18

what are the basic types of electrical faults

Answer 18

high energy
short circuit faults
overload faults

Question 18

what are circuit breakers deigned to do

Answer 18

designed to open the circuit incase of a fault
it is a electromechanical device

Question 18

3 types of circuit breakers

Answer 18

single pole ,single phase
three phase auxiliary
motor

Question 19

stop buttons used in PLC’S are nomrally closed or open?

Answer 19

closed

Question 19

what is plc

Answer 19

programable logic controller

Question 20

what are electrical interlocks for

Answer 20

prevents electrical equipment from operating out of sequence

Question 21

what are the two main styles of fuses

Answer 21

fast acting time delay

Question 22

what does HRC stand for

Answer 22

high rupturing capacity fuses