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PHYS 217 FINAL
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Exam of 6 pages for the course EGR 217: Exam at EGR 217: Exam (PHYS 217 FINAL)
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PHYS 217 FINALCharge - ANS-the property that causes matter to attract or repel
two kinds of charges - ANS-positive and negative
opposite charges _____ - ANS-attract
like charges ______ - ANS-repel
what does the number: 1.602 x 10^-19 C represent - ANS-the smallest unit charge of an
electron or proton
Coulomb's Law Equation gives the value of?: - ANS-Force exerted by a charge (q) on
another charge (qo) separated by a distance of r (r)
Coulombs Law can also be related to what other law - ANS-Newton's gravitational law
what are the 3 ways to charge matter - ANS-friction, conduction, induction
field - ANS-a physical quantity assigned to every point in space
Give the description of fields related to volumes of space/matter - ANS-Fields tend to
extend over a large volume and influence objects throughout that volume
A quantity defined by a field can... - ANS-be constant or vary throughout the volume
fields can have _______ quantities - ANS-vector or scalar
electric field - ANS-describes the force of an object with charge q
electric fields can also be called - ANS-vector fields
How do wireless communications work - ANS-electric field causes charges to move
along antenna
current - ANS-the rate of flow of charge
current through a resistance - ANS-voltage
, The Work Energy Term can be described as - ANS-a force acting through a distance
(scalar)
what is electric potential (or electric field potential/voltage) - ANS-the amount of work
needed to move a unit of charge
What is interesting about the relation between the electric field and the gradient of the
electric potential - ANS-the electric field is the negative gradient of electric potential
example of constant voltage sources - ANS-batteries and regulated power supplies
higher voltage indicates - ANS-higher current
what is the energy process of an electric circuit - ANS-kinetic to heat, light, mechanical
motion
resistance - ANS-the opposition of current in a material
what causes resistance - ANS-collisions as charges move through a material
what is the process of energy of resistance - ANS-electrical energy to heat
free electrons - ANS-electrons that easily break free from atoms
Conductors - ANS-material that easily allow flow of current
Insulators - ANS-material that strongly resist the flow of current
resistance quantity for commercial resistors - ANS-1 to 10 MOhms
resistance quantity for special purpose resistors - ANS--0.01 to 1 Ohms
Applications of resistors include: - ANS-heating, limiting current, timing, voltage division
How do you read a resistors value - ANS-through a color code where the last band
represents the value
SMD Resistor Coding - ANS-first numbers are the coefficient, last number is the
exponent, R is a decimal point
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