Resistors in series - Rt = R1 + R2 + R3 etc, Resistors in parallel - 1/Rt = 1/R1 + 1/R2 + 1/R3 etc, Kirchoffs voltage law (supply voltage) - Vs = V1 + V2 + V3 etc, Kirchoffs current law (supply current) - Is = I1 + I2 + I3 etc, Power - P = V I, Voltage - V = I R, I = V/R - Current, Resistance - R = V/I, P = I2 R - Power, Current is - Proportional to voltage, Current - Is inversely proportional to resistance, Resistance is - Proportional to length, Is inversely proportional to area - Resistance, Kirchoffs voltage law - The individual voltages when added together must equal the supply voltage, Kirchoffs current law - The individual currents used by the loads when added together must equal the supply current,

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