electricty Flashcards
what is a conductor
a material that lets electricity through it
what is an insulator
a material that doesn’t let electricity through it
do conductors have free elections
yes
do insulators have free electrons
no
what is the resistance inversely proportional to
the cross sectional area
what is resistance directly proportional to
the length
which way does current flow
from positive to negative
which way do the electrons flow
from negative to positive
what does electrical charge equal
current X time`
current is always the same in a
series circuit`
voltage in a series circuit equals
V1+V2+V3+V4………
what is ohms law
resistance=voltage/current
what does A mean
amps
what does V mean
voltage
which does the diode not obey
ohms law
Ways to increase the strength of a magnetic field
Increase the current flowing/ number of turns of the coil or place a soft iron core inside the solenoid
The force of the field lines get what as they get further away
Weaker
Where do magnetic field lines run from
North to South
Flemings ______ hand motor rule
Left
FLHMR thumb =
Movement
FLHMR forefinger =
Field
FLHMR second finger =
Current
Power =
VI or I2R or V2/R
Energy =
ITV or I2RT or (V2/R)T
