Kirchhoff's Circuit Laws
BlackBoard Notes

• Note to Jeff: Don't use too much space on the blackboard for the following pictures. You'll run out of room!

Rset = ? Easy to calculate!	Tough! Need a set of rules to handle this case!

• Current Rule:

I_in = I_out

I₁ = I₂ + I₃

• Voltage Law – Loop Rule:
  

Jumper #1 and ammeter configurations:

Loops:

• Sign conventions for voltage are in the instructions!
• Not Needed – Current flows: downhill through R's (–); uphill through Emf's (+). So, the sign of the voltage around a loop is (–) across resistors, in direction of current, and (+) across Emf, in direction of current!

• No meters needed!
• Short Circuit - Series: Have your circuit checked before proceeding!
• Short Circuit - Parallel: UNPLUG DC POWER SUPPLY BEFORE CONNECTING THIS CIRCUIT! Draw a circuit diagram, and explain/show: WHY?

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Revised: 15 Jan 2018

Canton, NY 13617