Electric Current Definition Explained

The question asks to identify the term defined as the "changes in charge with respect to time in a conductor". This definition precisely matches the concept of electric current.

In physics, electric current is quantified as the rate at which electric charge flows past a point or region. It represents how quickly charge is moving. The mathematical representation of electric current is:

$I = \frac{dQ}{dt}$

Where:

• $I$ represents the electric current (measured in Amperes).
• $dQ$ represents the amount of electric charge.
• $dt$ represents the time interval over which the charge flows.

Therefore, a change in charge ($dQ$) over a specific time ($dt$) fundamentally defines electric current.

Analyzing Other Options:

• Electric voltage: Voltage is defined as the potential difference or electrical potential energy per unit charge between two points. It drives the current but is not the measure of charge change over time.
• Charge density: Charge density refers to the distribution of electric charge over a distance, area, or volume. It does not involve the rate of change of charge with time.
• Electric static field: An electric static field is a field produced by stationary charges that does not change over time. It relates to the force experienced by charges, not their movement or rate of change.

Based on these definitions, electric current is the correct answer as it directly relates to the change in charge over time within a conductor.