# 4: Conservation of Charge

- Page ID
- 81487

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- 4.1: Four Questions
- The basics of what electric charge is and how it can be stored in, transported across the boundary of, or generated and consumed inside a system.

- 4.2: Conservation of Charge
- Different forms of the equation for conservation of net charge.

- 4.3: Physical Circuits and The Lumped Circuit Model
- Definition of physical circuits; discussion of the underlying assumptions of the lumped circuit model used to analyze them.

- 4.4: Ohm's "Law" -- A Constitutive Relation
- One of the most frequently used constitutive relationships in studying electrical phenomena is referred to as Ohm's Law. This, like every constitutive relationship, is not really a law but a well-worn and useful model for a specific physical phenomenon.

- 4.5: Simple Resistive Circuits
- How to solve a simple resistive circuit that satisfies the lumped circuit model, using Ohm's Law and the principle of conservation of charge. Includes worked example.