1• Source transformationsECE 201: Lecture 10Borja PeleatoSource combinations2• Voltage sources connected in series add up their voltages• Current sources connected in parallel add up their currents• DANGER: Voltage sources connected in parallel or current sources connected in series– If they are equal, they help each other and last twice as long– If they have different values, lab burns (not really, because they have internal resistances, but sparks usually come out…)Source transformation• The following two are equivalent:• If we put them both inside black boxes, we will never be able to tell which is which– If we short-circuit A and B, they both output Is amperes (and 0 voltage, obviously)– If we put a resistor Ro between A and B, they both output Vs/(R+Ro) amperes and 3Example4Dependent sources• The same transformation principle applies to dependent
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