ALL YOU NEED TO KNOW ABOUT ELECTRICAL ENGINEERING

Max Mathews, CCRMA, Stanford, MUS250a, 09/16/04

TOOLS

• multimeter
• scope
• signal generator
• circuit board
• soldering iron
• shop tools: drills, saws,etc
• pocket calculator (student supplied)

ELECTRICAL QUANTITIES

• voltage V (volts)
• current I (ampere (also milliampere, microampere) )
• impedance Z (ohms)
• power P (watts)

COMPONENTS:

• resistors R (ohms) Z = R
• capacitors C (farads) Z = 1/(s*C)
  • s = j*2pi*f, where f is frequency in Hz and j is squareroot( -1)
  • note-- farads = microfarads/1,000,000
  • microfarads=nanofarads/1000
  • nanofarads =picofarads/1000
• switches
• leds
• sensors
• op amps

EQUATIONS

• ohm's law:
  • E=I*Z
  • I=E/Z
  • Z=E/I
• power:
  • P=E*I
  • P=(I*I)*R
  • P=(E*E)/R
• voltage divider equation: Vout/Vin = Z2/(Z1+Z2)
• equivalent impedance of two circuit elements connected in series: Zeq = Z1 + Z2
• equivalent impedance of two circuit elements connected in parallel:
  • Zeq = 1/(1/Z1 + 1/Z2)
  • Zeq = (Z1*Z2)/(Z1 + Z2)
  • 1/Zeq = 1/Z1 + 1/Z2