###
conductors

are highly charged, charges flows freely, electrons are bound loosely.

eg. nail

###
insulator

almost no charge flows,fewer force elctrons eg. wood

###
semiconductor

fewer free electrons

###
Electroscope

detects chargy by induction and conduction, electroscope contains a conductors.

###
Electric potential ch.16

PEb-PEa=-qEd

W=-qEd

###
Electric potential Va ch.16

=Pea/q

###
Electric potential ch.16 Vba=Vb-Va

=PEb-PEa/q= -Wba/q

W= Fd

F=qE

v=w/q; V=Ed

E=delta V/d

E=-Vba/d

###
Coloumbs law ch.16

F= k Q1Q2/r^2

Fr= mv^2/r

kq^2/r= mv^2/r

mv^2r=kq^2

r=kq^2/mv^2

###
Electric field ch.16

E=F/q

###
number 59; ch.16

Fe=lqlE= mg=neE=4/3 pi r^2 pq

n=4 pi r^3 q/ 3eE

###
Point charge ch.16

E=Q/r^2= 1/4pi Eo

lfl=kQq/r^2

E=kQ/r^2= 1/ 4 pi Eo

###
Electron Volt ch.17

v=w/q

w=qv

###
Electron Volt

V=k Q/r; = 1/4 pi Eo-Q/r

###
Capacitance ch.17

C= Eo/d (A); C=KEo (A/d)

Q=CV

C=Q/V

###
Eo

8.85 x 10^-12 c^2/nm^2

###
Area of capacitance=

cd/Eo

###
Energy ch.17

U=1/2 QV

Q=CV

U=1/2(CV)V

U=1/2CV^2

V=Q/C

U=1/2 Q^2/C

###
17.9 Energy density

u= U/volume

u= Uvol= 1/2 CV^2/VOL

= 1/2 EoA/d (v^2/vol)

=vol= Ad

1/2 Eo A/d (Ed/ Ad)

u=1/2 EoE^2

###
Electric current CH.18

I= delta Q/ delta t

I= c/s

1 c/s= 1A

###
Ohms law ch.18

I proportional v

V=IR

R=V/I

###
chapter 18 Reseitance and ro

pT=po [1 + alpha (T-To)]

R=p L/A

Rt=Ro[1 + alpha (T-To)]

###
Resistance ch.18

R=p L/A

RA= pL

p=RA/L

###
Electric power chapter 18

P=IV= I (IR)= I^2 R

P=IV=(V/R)V= V^2/R

###
Electric power chapter 18

P= energy transformed / time

=q/t x v

P=IV

###
Alternatinv Current-chapter 18

P=Irms Vrms= Ipeak/ square root of 2 Vrms

= square rt of 2 (P)/vRMS

: P=1/2 Io^2 R= l^2rmsR

:P=1/2 Vo^2/R= V^2rms/R

: Vo=square rt 2 (Vrms)

###
Alternating Current- Peak current ch.18

I=V/R

###
Alternating Currents Chapter 18; I^2

=1/2 Io^2 and V^2=1/2 Vo^2

Irms= square route of I-> Io/square root of 2

Vrms-> Square root of V-> Vo/Square root of 2

###
Capacitance of an axon area of cylinder; chapter 18

A= 2pi r L

c= KEo A/d

Q=cv

v=pi r^2 L

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