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ALT 103

The SI unit of charge is what? Coulomb
Coulomb's Law describes what? The attractive and repulsive forces between two charged particle. It depends on the charges of the particles and the distance between them.
1 electron and 1 proton have the same charge. What is that fundamental/elementary charge of 1 electron and proton? e = -1.60 x 10^-19 C p = 1.60 x 10^-19 C
When does an object carry a charge? When the amount of positively or negatively charged particles out number the amount of the other particle. (Gaining or losing electrons)
What is the mass of an electron? 9.11 x 10-31 kg
Describe the relationship between electrons and their nucleus inside of insulators and conductors. Insulators: Electrons are tightly bonded to the nucleus Conductors: Electrons are NOT tightly bound to the nucleus (float around in outer cloud)
What are two most common sources of emf? (Electromotive force) Generators (mechanical energy>kinetic energy>EMF Batteries > chemical energy > EMF
As temperature increases, how does resistance react? When temperature rises, resistance rises. It is ideal to keep wires cold to eliminate resistance but keeping wires very cold is impractical.
Conventional current always flows from where? Electrons flow from where? Conventional current flows out of the positive terminal of the emf, and electrons flow out of the negative terminal of the emf
In a series circuit, if one light bulb is burnt out how do the others react? They all burn out because the electricity is connected in a straight line
Describe measuring voltage, current and resistance in a SERIES circuit. Voltage= V1 + V2 + V3 Current = I1 = I2 = I3 Resistance = R1 + R2 + R3
Describe measuring voltage, current and resistance in a PARALLEL circuit. Voltage = V1 = V2 = V3 Current = I1 + I2 + I3 Resistance = (1/R1)^-1 + (1/R2)^-1 + (1/R3)^-1
Snell's Law a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves
Step Up Transformers, Step Down Transformers Step Up transformers = voltage ^, current down Step Down transformers = current ^, voltage down
Newton's 1st Law First law: The velocity of a body remains constant unless the body is acted upon by an external force
Newtons 2nd Law The acceleration a of a body is parallel and directly proportional to the net force F and inversely proportional to the mass m, i.e., F = ma.
Newtons 3rd Law The mutual forces of action and reaction between two bodies are equal, opposite and collinear.
Dielectric Breakdown Maximum potential difference a dielectric can withstand (breakdown meaning becomes a conductor)
MAGNETIC FIELD LINES Out of north, into south. Higher density, higher strength, direction tangential to line and towards the south. Lines always close.
3 Types of magnetic materials Ferromagnetic(Ironlike), Paramagnetic(interact little with b-fields), diamagnetic(repel magnetic fields)
Magnetic fields are created by moving charges, in iron,nickel,cobalt, it is the circulation electrons thatare responsible for magnetic fields TRUE!
RHR #1 Point thumb in the direction of the conventional current in the wire. Your extended fingers will curl them in the direction of the magnetic field
Created by: calv18