Electric current and Ohm's law is very much essential parts of knowing as an electrical engineer. I'll provide brief explanations for each term:

**Electron Drift Velocity:**

The average velocity of electrons in a conductor in response to an electric field.

**Charge Velocity and Velocity of Field Propagation:**

Charge velocity refers to the movement of electric charge, typically electrons. The velocity of field propagation is the speed at which changes in the electric field travel through a medium.

**The Idea of Electric Potential:**

Electric potential, or voltage, is the electric potential energy per unit charge at a point in space. It represents the work done by an external force in bringing a charge from infinity to that point.

**Resistance:**

The opposition that a material offers to the flow of electric current.

**Unit of Resistance:**

The unit of resistance is the ohm (Ω).

**Law of Resistance:**

Ohm's Law states that the current passing through a conductor between two points is directly proportional to the voltage across the two points, given a constant temperature.

**Units of Resistivity:**

Resistivity is measured in ohm-meter (Ω·m).

**Conductance and Conductivity:**

Conductance is the reciprocal of resistance. Conductivity is the measure of a material's ability to conduct electric current and is the inverse of resistivity.

**Effect of Temperature on Resistance:**

Generally, the resistance of conductors increases with an increase in temperature.

**Temperature Coefficient of Resistance:**

A measure of how much a material's resistance changes per degree Celsius change in temperature.

**Ohm’s Law:**

States the relationship between voltage, current, and resistance:

V=I×R.

**Resistance in Series:**

The total resistance in a series circuit is the sum of individual resistances.

**Voltage Divider Rule:**

A rule used to find the voltage across a specific resistor in a series circuit.

**Resistance in Parallel:**

The reciprocal of the total resistance in a parallel circuit is equal to the sum of the reciprocals of the individual resistances.

**Types of Resistors:**

Resistors can be fixed or variable. They come in various forms such as carbon composition, film, wire-wound, etc.

**Nonlinear Resistors:**

Resistors whose resistance changes with voltage or current, like varistors.

**Varistor:**

A variable resistor whose resistance decreases with increasing voltage.

**Short and Open Circuits:**

A short circuit occurs when there is a low-resistance connection between two points, bypassing the normal load. An open circuit occurs when there is a break in the circuit,

**‘Shorts’ in a Series Circuit:**

A short circuit in a series circuit would interrupt the flow of current.

**‘Opens’ in Series Circuit:**

An open circuit in a series circuit would also interrupt the flow of current.

**‘Open’s in a Parallel Circuit:**

An open circuit in a parallel circuit would not affect the other branches.

**‘Shorts’ in Parallel Circuits:**

A short circuit in a parallel circuit would create a low-resistance path for current.

**Division of Current in Parallel Circuits:**

The total current entering a parallel circuit is divided among the different branches.

**Equivalent Resistance:**

The single resistance value can replace a set of resistors in a circuit without changing the overall current or voltage.

**Duality Between Series and Parallel Circuits:**

There is a mathematical relationship between series and parallel circuits called electrical duality.

**Relative Potential:**

The electric potential at a point relative to some reference point.

**Voltage Divider Circuits:**

Circuits where a series of resistors divide the voltage in a predictable manner.

These concepts collectively form the foundation of understanding electrical circuits and their behavior.

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