Physics Week 24: Introduction to dc circuit analysis

The main topics covered during week 24 in the Physics course from the Ron Paul Curriculum were: EMF, terminal voltage, resistors, resistance circuits, and Kirchhoff’s law.

Lesson 1:

EMF: something that producing energy and an electromotive force

Resistors in Series: in a series circuit the total resistance is equal to the sum of the individual resistances.

Series circuit rules:

  • The current is the same throughout the “loop”
  • The voltage across each component (resistor) must add up to the same magnitude as the voltage source.

Resistors in Parallel: The reciprocal of the total resistance is equal to the sum individual resistances reciprocals

Lesson 2:

Practice problems

Lesson 3:

Circuit analysis: Kirchhoff’s laws are used to analyze complex circuits

Kirchhoff’s Laws:

  • Junction Rule – based on the fundamental law, conservation of charge
  • Loop Rule – based on the fundamental law, conservation of energy

Diagrams:

Problem solving steps:

  • Label the currents
  • Identify the unknowns
  • Apply Kirchhoff’s junction rule
  • Apply Kirchhoff’s loop rule
  • Solve the equation for the unknowns

Lesson 4:

EMF’s in Series: The total voltage is the algebraic sum of their voltages

EMF’s in Parallel: EMF sources in parallel do not increase voltage, rather they are connected in parallel to reduce the amount of current each source must produce.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s