Hydrogen Fuel Cells
Meredith Thomas
Elect. 101
December 4, 2008
Hydrogen Fuel Cells
Hydrogen fuel cells have the potential to solve many major problems America faces
today. Hydrogen is a versatile ene
U niform Circular Motion
James Poole
* * *-* *-9001
Physics 211 L Monday 12:20 P.M.
Project due Monday March 23, 2009.
Abstract: I n this lab I used the relationship between force and acceleration
i n
1797-1878
Physics 212
Fall 2009
Induction III
Inductors
10/23/09
Summary
Faradays Law: A changing magnetic ux causes an EMF.
dB
= N
dt
Lenzs Law: An induced current has a direction such that the magn
Physics 212
Electromagnetic Induction II
10/21/09
Fall 2009
Faradays Law
An ammeter is connected to a coil of wire. A magnet is sitting motionless next to the wire
such that its south end is near the
Physics 212
Electromagnetic Induction
10/19/09
Fall 2009
Summary
Solenoid - Turns of current carrying wire in close-packed coils
current enclosed
n =# turns / length
ienc = ni
Amperes Law
B ds = oien
PHYS 212
Fall 2009
Fields Due to Currents
10/5/09
Summary
Force on a wire
F = qE + qv B
F = iL B
Torque on a current loop
= B = NiA
Force on a charge
p
Electric Dipole
Magnetic Dipole
Q - Is a curr
Phys 212
Amperes Law
Fall 2009
10/7/09
Schedule
Wednesday - HW6 Due
Thurs, Fri - Fall Break
Mon - Review I
Wed - Review II (HW 7 Due!)
Fri - Exam II
Exam is on all subjects covered to date
Emphas
PHYS
Fall 2009
Review II
10/14/09
Schedule
Wednesday
Magnetic Concepts, HW problems
Review of Earlier Material
Friday - Exam2!
Same procedure as Exam1
Magnetic Force on a Wire
A portion of a loop
Jonathan Morreale - 2016 Spring, PHYS 212 (mi
Test 1
1
5 pt Did you enter your name at the top of this sheet?
Did you enter your name and student number on the answer
sheet and bubble them in with opa
Jonathan Morreale - 2016 Spring, PHYS 212 (mi
Test 3
1
5 pt Did you enter your name at the top of this sheet?
Did you enter your name and VIP ID on the answer sheet
and bubble in your VIP ID with opaq
JOHN EVERHART - 2015 Spring, PHYS 202 (mishra 1
Sp15 - Final
5 pt Did you enter your name at the top of this sheet?
Did you enter your name and VIP ID on the answer sheet
and bubble in your VIP ID wit
b b 2 4ac
2a
=
m
F
p=
V
A
r r r
r = r2 r1
a y = a sin
r
a = a = a x2 + a y2
ay
ax
= tan 1
x = x0 + 0 x t + 12 a x t 2
K = 12 mv 2
W=K
U g = mgy
W g = U g
Fs = kx
1
U s = kx 2
2 r
rf
r
W = F (r )
Electric Charge
Electricity and Magnetism
! Electricity and magnetism have been known for
thousands of years
The ancient Greeks knew that a piece of amber rubbed
with fur would attract small, light o
Electric Fields
The Electric Field (1)
So far we have thought of the electric Force
between two stationary charges
Suppose one charge were moving, how would the
second charge know that the first cha
Gauss Law
Water Flux
Let s imagine that we put a ring
with area A perpendicular to a
stream of water flowing with
velocity v
The product of area times
velocity, Av, gives the volume
of water passing
1
Formulae: Phys.212
IMPORTANT: Please show your calculations on the sheets provided.
Simple Units: [Charge]=C; [Energy or Work]=J; 1eV=1.602 1019 J; [Electric-
Field]=N/C=V/m; [Capacitance]=F; [Induc
1
PHYS 212 Essentials of Physics II: Fall 2015
About the Lectures and the Professor
Lectures: We shall begin promptly at the appointed hour. The rst 10-15 minutes of each
lecture will be devoted to a
Physics 212
10/26/2009
AC Generation
Fall 2009
Schedule
AC Power
Impedance, Phasors
Oscillations
Magnetism
Maxwells Equations
This Week
Next Week
Summary
Electromagnetic Storage Devices
Inductor
Physics 212
LCR Oscillations
10/30/2009
Fall 2009
Electronic Signal Speed
In an AC circuit, electrons are moving back and forth at a frequency . The signal that the
electrons receive to change directi
Physics 212
LCR Circuits
10/28/2009
Fall 2009
Summary
AC Voltage
RMS (Root-Mean-Square) VRMS, IRMS
V = V0 sin(t )
= 2f
f=
1
T
=
IRMS =
2
T
IPVP = ISVS
Magnetic ux change is the same
due to iron core
PHYS
Fall 2009
Review I
10/12/09
Schedule
Monday
Magnetic Concepts, HW problems
Wednesday
Magnetic Concepts, HW problems
Review of Earlier Material
Field and Force
A positive charge moves paralle
PHYS
FALL 2009
Magnetic Fields
Magnetic Forces
9/30/09
Summary
When both electric and magnetic elds are present, a moving charge will feel a combined force.
!
!
!
F = qE + qv " B
This is known as the
PHYS
FALL 2009
Magnetic Fields
Magnetic Forces
10/02/09
Schedule
Today - Magnetic Fields III
Monday - Magnetic Fields due to currents
Wednesday - HW6 Due
Thurs, Fri - Fall Break
Mon - Review I
W
Phys212 Fall 2009
Circuits II - 9/25/09
Solving Circuits
Potential Method - Rules Current Direction - current ows in the direction that positive charge carriers move
Kirchhoffs Junction Rule - sum of
PHYS 212
FALL 2009
Magnetic Fields
Magnetic Forces
9/28/09
Magnetic Forces
It is observed that objects attract or repel each other or attract bits of iron
Like poles repel
Opposite poles attract
Dipol
PHYSICS 212
Fall 2009
Current and Resistance
9/21/2009
Moving Charges
Switch from electrostatics to charges in motion
Moving Charges Cause Currents
household wiring
lightening
solar wind
beam of elect
Physics 212 Fall 2009
Circuits - 9/23/09
Current and Resistance
b
Current
i=
q
t
(A)mpere=(C)oulomb/(s)econd
Resistance
R
vd =
i1
A ne
V=Vb-Va
a
V
i
Ohm=Volt/Amp
R=
L
A
Power
i
Ohmic Devices:
U
= P =
Physics 212 - Fall 2009
Capacitance I
9/14/2009
Schedule
Today - Capacitors I
Tuesday - New homework available
Wednesday - CAPA hour, Exam
Friday - Capacitors II
What is a Capacitor?
Useful Device - S