Inducing Current Using Magnetic Fields

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18 Οκτ 2013 (πριν από 3 χρόνια και 8 μήνες)

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6.09
-
01b

I
nducing Current Using Magnetic F
ields

(Lenz’s Law at work…)

Stepping back from the Right Hand Rules

True:




current is moving _____________



Moving electrons cause _____________ fields



Magnetic fields caused by current can interact with _________________
_________


Can we turn cause and effect on its head?

Outside magnetic fields can







The
_____________

Effect

The act of using a





The ideas behind

__________________________















The direction of the induced current in a loop
will set up







According to right hand rule #2 for
_____________, the magnetic field of the
solenoid will have a _____________ that
follows the
__________________________curl.


Inducing Current Scenario



The
________________________
that a
_____________
is forced throu
gh a magnetic field is up.



But, because the
__________________________
field around a wired
_____________

the outside
_____________



This means that the wire’s motion will experience a force
_____________

its
_____________
.

5

N





S

A)

B)

Personal
Notes:


































6.09
-
01b

Right Hand Rule #3

compared to

_____________

Law!


Right Hand Rule # 4



Some Questions (diagram “a” just labels the 3 directions of motion). What will hap
pen
for each of the motions described in b,c, and d?




Personal
Notes
:


































6.09
-
01b

N=2

N=4

N=6

Right hands ready?!?



What direction does the opposing right hand rule tell us about the direction of the
induced current?


_____________

and Opposite
_____________


(Lenz’s Law for induction)



Inducing
_____________

Current



The back and forth motion of a
_____________

in the vicinity of or
_____________

a
_____________

will induce a
__________________________
current flow.



This is known as
__________________________

(
AC
)


More Loops →
______
_________________________________
→ More Power









The induced _____________ is _____________the product of the
__________________________and the time __________________________through the
loops:


V
α

N
×
Area×(Change in B/Change in time)

A = Area of a single loop

If t
here’s lots of loops,
your magnet’s strong
and it wiggles fast…
t桡琠摯ty潵oge琿

me牳潮r氠
乯瑥猺


































6.09
-
01b


Using Induced Current to Perform Tasks



Not only can a
_____________
create current, but that current
can be used to make
__________________________
.



Follow the current in the diagram at the right and
determine the North e
nd of the Secondary coil When the
magnet is pushed into the 1
st

coil.


Transformers

(
_____________

from current


_____________

from fields)



The result of coils producing fields and fields inducing
current is that
_____________

can
_____________

be
transfe
rred to a
__________________________
.



This is called a
_____________






Electrical Power
Transmission


The _____________ of
electric power makes use
of transformers at various
stages between the
_____________ and our
_____________.


P = __________
___

----------------------------------------------------------------------------------------------------------

Transformer Equation:

_____________

Power In = Power Out:


_____________

Using Power
Conservation…

P
p
=P
s

V
p
I
p
=V
s
I
s

V
p

=

V
s


P is for Primary

S is for Secondary

Personal
Notes:


































6.09
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01b