, Current
Electricity
Definitions :
potential difference : Work done per mit positive charge
·
W
W
-
measured in V or Jos" ; v =
Y9
9
-amount of push given vs .
amount of charge
·
emf (electromotive Force) :
the total energy supplied per coulomb of charge by the cell
measured in Volts
·
comes from cell (1 . SV cell has o n emf of 1 .
51)
·
current : the rate of flow of Charge
-measured Amperes (A )
:
in or C S .
g
F =
-
t
·
resistance : a material's opposition to the flow of electric current
-
resister : a material that keeps current from flowing
V V -pd
-
R =
1 FIR
↓
cur rent
measured in Ohms -
·
coulomb : measures charge
·
until energy is used (chemical reactions in cell have occured) , it is potential energy "turns into electrical
energy once used
Ohm's Law :
current through conductor is
directly proportional to the potential difference across the conductor at constant temp .
·
a a
> current a
voltage =
directly proportional
R is
always gradient
·
Ohmic conductors : Conductors that obey Ohm's law
·
non-ohmic conductors :
do not obey Ohm's law as their temperature increases (no constant temp) .
1/R
·
R
Voltage
↑
chmic non-emi
Series Circuits
series circuit : If resistors are connected so that there is only one
path they can flow through
·
V I R series
·
in
I is constant (I total
:
I , FFz ) ...
·
Resisters a re potential difference dividers (Votal =
V ,
+
z ) ...
Rtotal R, Rz
-
= + . . .
The biggest resister will have the greatest potential difference across it (bigger R-bigger difference before vs after
·
.
Parallel Circuits
·
Parallel Circult : when resisters a re connected so that there Is MORE THAN ONE path current can flow through
·
VI a R in Parallel
current divides
; resisters divide current (I total I , F2 ...
·
potential difference is constant (Vtotal =
V, =
Vz )
. .
·
resistance is less than each branch ( ...
); for 2 resisters (Proe
E ↓
smallest Flip to get ans
Electricity
Definitions :
potential difference : Work done per mit positive charge
·
W
W
-
measured in V or Jos" ; v =
Y9
9
-amount of push given vs .
amount of charge
·
emf (electromotive Force) :
the total energy supplied per coulomb of charge by the cell
measured in Volts
·
comes from cell (1 . SV cell has o n emf of 1 .
51)
·
current : the rate of flow of Charge
-measured Amperes (A )
:
in or C S .
g
F =
-
t
·
resistance : a material's opposition to the flow of electric current
-
resister : a material that keeps current from flowing
V V -pd
-
R =
1 FIR
↓
cur rent
measured in Ohms -
·
coulomb : measures charge
·
until energy is used (chemical reactions in cell have occured) , it is potential energy "turns into electrical
energy once used
Ohm's Law :
current through conductor is
directly proportional to the potential difference across the conductor at constant temp .
·
a a
> current a
voltage =
directly proportional
R is
always gradient
·
Ohmic conductors : Conductors that obey Ohm's law
·
non-ohmic conductors :
do not obey Ohm's law as their temperature increases (no constant temp) .
1/R
·
R
Voltage
↑
chmic non-emi
Series Circuits
series circuit : If resistors are connected so that there is only one
path they can flow through
·
V I R series
·
in
I is constant (I total
:
I , FFz ) ...
·
Resisters a re potential difference dividers (Votal =
V ,
+
z ) ...
Rtotal R, Rz
-
= + . . .
The biggest resister will have the greatest potential difference across it (bigger R-bigger difference before vs after
·
.
Parallel Circuits
·
Parallel Circult : when resisters a re connected so that there Is MORE THAN ONE path current can flow through
·
VI a R in Parallel
current divides
; resisters divide current (I total I , F2 ...
·
potential difference is constant (Vtotal =
V, =
Vz )
. .
·
resistance is less than each branch ( ...
); for 2 resisters (Proe
E ↓
smallest Flip to get ans
