Lecture 1 - Resistors

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  • RESISTOR, RESISTANCE + BASIC ELECTRONICCIRCUITS
    • KIRCHOFF'S LAWS
      • CURRENT LAW
        • "Sum of currents in a network of conductors meeting at any node = ZERO."
        • I1 + I2 + I3 + I4 = 0
      • VOLTAGE LAW
        • "Sum of all voltage drops + sources around any loop = ZERO."
    • RESISTIVITY
      • Resistance of an ohmic conductor...
        • Proportional to LENGTH
        • Inversely proportional to CROSS SECTIONAL AREA
      • Resistivity = Resistance x cross-sectional area / length
    • VOLTAGE DROP + CURRENT
      • Current PROPORTIONAL to VOLTAGE.
    • RESISTANCE
      • Resistance = Voltage / Current
        • R = V / I
      • Ohm's Law
        • Voltage = Current x Resistance
          • V = IR
          • R independent of V
        • Collisions between electrons + fixed charges in material
      • Units
        • Volts per Ampere
      • Admittance
        • Reciprocal of resistance
          • Y = 1 / R
    • ORIGIN OF A MATERIAL'S RESISTANCE
      • 1. Electrons move in conductor due to external potential
        • 2. Electrons collide with the conductor's lattice
          • 3. Energy lost and repeatedly re-accelerated by electric field
            • 4. Collision process creates internal friction
    • RESISTANCES iN CIRCUITS
      • SERIES
        • Follows voltage law
        • R = R1 + R2 + ... + Rn
      • PARALLEL
        • Follows current law
          • 1/R = 1/R1 + 1/R2 + ... + 1/Rn
    • RESISTIVITY OF CONDUCTORS
      • Good conductors = LOW resistivity
      • Insulators = HIGH resistivity

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