Flashcards
Analogue Electronics & Physics
Flashcards do conjunto (27)
- 1Define a "conductor".An object or type of material that allows the flow of an electrical current in one or more directions.
- 2Define an "insulator".A material whose internal electric charges do not flow freely; very little electric current will flow through it under the influence of an electric field.
- 3What is the Fermi Level?The energy at which the probability of a state being occupied is one-half.
- 4Define a "semiconductor".A substance/material that has an electrical conductivity value falling between that of a conductor and an insulator. The most common material used is silicon.
- 5Define "(semiconductor) doping".The intentional introduction of impurities into an intrinsic semiconductor for the purpose of modulating its electrical properties. The doped material is referred to as an extrinsic semiconductor.
- 6What is Ohm's law?Current = Voltage / Resitance
- 7What is Kirchoff's Current Law?The net sum of currents flowing into a node is zero.
- 8What is Kirchoff's Voltage Law?The sum of all voltage differences around components in a closed loop is zero.
- 9What the key parallels in the hydraulic analogy?Volume = Charge
Flow = Current
Pressure = Voltage
Narrow pipe = Resistor
Wide pipe = Wire - 10What are the six properties of an ideal o-amp?1. Infinite gain (at all frequencies).
2. Perfect differential gain (no offset voltage: Vout = 0 when Vin+ = Vin-).
3. Infinite input resistance (no current flows into the inputs).
4. Zero output resistance.
5. No added noise.
6. Output can swing from Vcc- to Vcc+ anywhere in range of power supply. - 11Define a "field" (in the sense of an electric or magnetic field).ELECTRIC: an electric field is an area that surrounds electric charges which attract or repels other electric charges.
MAGNETIC: a magnetic field is an area created by moving electric charges & magnetic dipoles and exerts a force on other nearby moving charges & magnetic dipoles.
GENERAL: a field is a function that maps force within an area of space. - 12Define "potential" (in the sense of electric or magnetic potential).ELECTRIC: the energy required to move a unit charge from infinity to the location in space a distance, r, from the charge, q.
- 13Define "flux" (in the sense of electric or magnetic flux).A theoretical way of representing some vector fields using lines.
- 14Define a "dipole"....
- 15Define "resistance"....
- 16Define "capacitance"....
- 17Define "inductance"....
- 18Define an "excited state" (in the sense of the energy of an electron in an atom)....
- 19Define a "polarisation field"....
- 20Define a "magnetisation field"....
- 21What is a phasor?PHASe vectOR
A complex number which represents the amplitude and phase of a cisoid (but not the frequency).
z(t) = Bexp(jωt) where B=Aexp(jθ) - 22What is a deciBel?A unit of measurement used to express the ratio of one value of a physical property to another on a logarithmic scale.
Bel = log(a power/another power)
deciBel = 10 x log(a power/another power) - 23What is meant by "dBV"?Voltage(dBV) = 20 x log(Voltage/1 Volt)
dBV = one volt (across the same resistor) - 24What is meant by "dBm"?Power(dBm) = 10 x log(power/1 milliWatt)
dBm = one milliWatt - 25What is meant by "dBW"?...
- 26What is meant by "dBu"?...
- 27Define Thevenin's Theorem.Any two-terminal linear network can be replaced by an equivalent network composed of a voltage source and a series resistor, with no effect on any external circuit.
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- First year Electronic Engineering FlashCards sobre Analogue Electronics & Physics, criado por Pippa Davies em 09-04-2018.
- Criado por
- Pippa Davies
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