Exam 1 (Electronics & Electromagnetic Radiation) Flashcards
Battery
provides potential energy to move charge through circuit
Resistor
resists flow of charge
Ground
point of zero voltage
AC signals…..
Change with time
Capacitor
device to store charge
Big current =
Small impedance
Inductor
Coil of wire
At low frequencies (woofer)
capacitive reactance gets bigger
angle gets bigger
At high frequencies (tweeter)
capacitive reactance gets smaller
angle gets smaller
Conductivity
overlap between valence & conduction band
Dopant
Introduces a charge carrier
Bipolar transistors
Produce an output signal that is larger than the input signal
Bipolar transistor function
- VBE forward bias E/B junction
- Holes spill to base & collector region
- Bias VBC to attract holes
Small VBE causes large change in VBC
Amplification
Small signal to control larger signal
Transformer
step voltage up or down
Advantages of digital signals
- makes data storage & manipulation easier
- less susceptible to noise
- easy transmission of signal
Clock
transition from high to low voltage
Signal Shaper
noise reduction
Constructive interference
2 waves in the same direction make 1 wave
Destructive interference
2 waves in opposite directions cancel
Bulk interactions (wave-like behavior)
diffraction
refraction
reflection
Atomic and molecular interactions (particle)
emission of light
absorption
scattering
Diffraction
beam of radiation is bent as it passes through a narrow slit
Refraction
beam of radiation is bent as it passes from one medium into another
