7 - Electricity and Magnetism Flashcards
Charge is given units that are of
coulombs (C)
Coulomb’s Law:
F = k q1q2
r^2
Universal Law of conservation of charge=
Center of charge=
Field=
the universe has no overall charge, every
Proton and electron cancel each other out.
is a point from which the charge generated by an object or system of objects can be considered to originate.
is a man-made concept designed to explain action at a distance. Which can be represented bylines of force (POSITIVE TO NEGATIVE)
gravitational force=
Potential Energy (U)=
Voltage (V) is the potential for work by an electric field in moving any charge from one point to another.=
F = Eq
U = Eqd
V = Ed
Equipotential surfaces=
Electric dipole=
all points on an equipotential surface are at the same voltage.
is created by two opposite charges with equal magnitude.
Conductors=
Resistors=
Induction=
such as metals, allow electrons to flow relatively freely.
hold electrons tightly in place (poor conductors).
charging a conductor since the electrons flow easily along conductors.
Current=
Circuit=
Resistivity=
moving charge. And is given in amps (A) or C/s
is a cyclical pathway for moving charge.
is the resistance of the flow of charge.
Resistance (R)=
Ohm’s law=
the quantitative measure of an object of a particular shape and size to resist the flow of charge. And is measured in ohms.
V = iR
Node= .
Kirchoff’s first rule=
Kirchoff’s second rule=
is any intersection of wires
states that the amount of current flowing into any node must be the same amount that flows out.
states that the voltage around any path in a circuit must sum to zero.
Electromotive force (EMF)=
Capacitor=
Parallel plate capacitor=
fancy word for voltage.
is used to temporarily store energy in a circuit. It stores it in the form of separated charge.
two plates made from conductive material are separated by a very small distance.
C = Q/V —> high capacity can store a lot of charge at low voltage.
U = 1/2(QV) or U = 1/2(CV2) or U = 1/2(Q2/C)
Dielectric Constant (K)=
refers to the substance between the plates of a capacitor. The substance between the plates must be an insulator, otherwise it would conduct electrons from one plate to the other, not allowing any buildup of charge.
Resistor=
Capacitor=
Battery=
zig-zag lines. (Can be in series if connected directly lined up to each other, or in parallel if not connected directly lined to each other.
two sideways T’s facing the horizontal part together and are the same length.
two sideways T’s facing the horizontal part together and aren’t the same length.
Resistors in series=
Resistors in parallel=
Capacitors in series=
Capacitors in parallel=
R eff= R1 + R2 +…
1/R eff= 1/R1 + 1/R2 +…
1/C eff= 1/C1 + 1/C2 +…
C eff= C1 + C2 +…
Electric power=
** P = iV **
and
**P = i^2R **
and
** P = V^2/R**
Direct Current (dc current)=
Alternating current (ac current)=
where the net movement of electrons is in one direction around the circuit.
is created by oscillating electrons back and forth in simple harmonic motion.
- a changing electric field creates? What does create one?
- a moving charge experiences force when moving through?
- The force is ________ to both the velocity and the magnetic field.
*A changing electric field creates a magnetic field. A stationary charge does not create a magnetic field.
*A moving charge experiences force when moving through a magnetic field.
*The force is directed perpendicularly to both the velocity and the magnetic field.
