test 3
can electrostatic charge be created/destroyed
no it can only be transferred
what materials conduct metals
ones that allow changed to move relatively easy due to atomic structure
materials that insulate
make it difficult for charges to move
what is 1 ampete (amp)
6.25 x 10^18 electrons
charge of one electron
1.6x10^-19
what is a positive columb (C)
6.25 x 10^18 protons
what is a negative columb (C)
6.25x10^18 electrons
to find charge of columbs
ne =Q x 6.25 x 10^18
or Q=ne/6.25x10^18
ne = electron number
what is induction
if charged object is brought near neutral conditional object it will induce charge into neutral object
why is induction
when the charged object goes next to tye neutral object, the electrons in the neutral object go closer or further from the charged object depending on the charge, creating an imbalance in the perviously neutral object, creating a charge
what is a current
moving electrons theough repelling/attracting
what is a current defined as
the amount of charge flowing per second measured in ampetes (amps/A)
what is the equation for current
I=Q/t = (ne x 1.6 c 10^-19)/t
I is current (A)
Q is charge (C)
t=time (seconds)
what is a direct current
circuits using direct current meaning charge only flows in one direction (batteries)
what is an alternating current
direction changed constantly (periodically moves back and forth between negative and positive) (sin graph)
how to measure a current
an ammeter is placed in circuit and charge is measured as electrons flow through (how many pass)
what is electric potential energy (voltage)
the PE stored per unit of charge (positron)
generally asked abt change in voltage
equation for change in voltage
(triangle)V=E/Q
V is voltage change in volts (1V is 1J/C)
E is electric potential energy used in joules
Q is change in columbs
what is voltage defined as
energy lost by each columb of charge
as charge progresses around circuit energy is lost into components
how is voltage/diff measured irl
voltmeter is placed outside of circuit, across load measuring and the before and after load is measured and diff is found
what does E= triangleV x Q tell us
if Q= I x t then
E= triangleV x I x t
what happens fo the energy as it passes through resustor
resistor gets hot as the electrical enegy becomes thermal
this means that W=QV
what is the energy transfer of circuits
circuits can be transformed to heat, sound or light from the electric potential energy
what does the amount of energy transferred from EPE depend on
amt of PE used by each charge (V)
nunber if charges passing through section (Q)
what is the pitential diff
the voltage drop
the change in voltage between two locations
what is resistence
the ratio of voltage drop across conductor fo current flowing through it
what is equation of resistance
R=V/I (Ohms Law)
measured in Ohms or horse shoe thing
Ohm=V/A
properties of Ohmic devices
constant resistance
fixed ratio of V/I (straight y=x graph of ratio)
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