Battery – to provide the charge to the current
carrying wire
Paper Clips – to hold the current carrying wire, and to stabilize it providing a base to
sit on
Copper wire – acted as the current carrying
wire, which spun.
Magnet –
provided magnetic force to cause the current carrying wire to exert a torque
Rubber band – To hold everything together
·Why did you
scrape the armature in a specific way?
If the wire received power the entire time, it
would not try to spin around to get away from the magnet, and would remain sedentary.
·Why does
the axle spin?
The axle spins, because the current in the wire
if perpendicular to the magnet, and a magnetic force is produced with that, and
so the force tries to exert a force in the form of a torque to rotate it.
Charges-
There are three ways to create change in charges, friction, contact, and
induction. The first two take them by touching, which steals electrons.
Induction however does not touch, and uses its high amounts of energy to move
electrons. The two types of charges are negative and positive. They are
attracted to each other. They do hate being next to like charges though.
Polarization-
Is where charges separate, but the object as a whole stays neutral. This
happens when something which is very charged comes into close proximity with a
neutral item. As the distance increases the force decreases.
Electric fields-
The area around a charge can influence another charge. Electronics are put in
an electric field inside a metal container, which blocks outside forces, by
having forces from every direction.
Voltage-
is the electrical measure of Potential energy. A volt is how much PE an object
has, and Voltage is the difference in PE two objects have.
Circuits- To
complete a circuit current must be able to flow from one end out of the power
source, to back in. If at all there is a break in the wire in a series circuit
the entire current will disappear. In a parallel circuit the power will still
flow as long as the break happened after meeting the first light or appliance.
Parallel circuits have fuses, because adding objects to the circuit increases
current. A fuse works by breaking the circuit in case the wire becomes too hot.
A series circuit has a certain amount of current, which diminishes with the
number of lights/ appliances attached, due to resistance.
Formulas
From the unit
Power = Current (Voltage)
Current = Potential energy / charge
Current = voltage / resistance
Coulomb’s law
Power
= watts
F=k Q1 (Q2) /d (d)
Things
students often forget
·That volts and voltage are two different
things. A volt is the amount of PE, and voltage is the difference in PE.
·Being polar does not mean the item has a
charge.
·Flow arrows point to what a positive
atom would do.
·The act of lightning is not induction,
but rather the build up on the ground.
·The same numbers of electrons that flow
out of a battery come back in on the negative side.
How
this relates to the outside world
Electricity is an integral part of
our daily lives, and having a simple understanding of it is crucial to better
knowing the world around us. Parallel and series circuits, lightning rods, and
dryer sheets are things we interact with daily. Knowing those makes us more
able to take care of issues our selves, and opens the gates for new robot
designs.
