what name is given to the work done per coulomb of charge passing between two points?
The name given to the work done per coulomb of charge passing between two points is electric potential difference, commonly known as voltage or potential difference.
This fundamental concept in electricity arises when electric charges move through a field, requiring energy to overcome the field's forces. Measured in volts (V), one volt equals one joule per coulomb (1 V = 1 J/C), quantifying the energy transfer per unit charge.
Core Definition
Electric potential difference (V) is defined by the formula V=WQV=\frac{W}{Q}V=QW, where W is work done (in joules) and Q is charge (in coulombs).
For instance, moving 1 coulomb of charge through a 12 V difference requires 12 joules of energy, illustrating everyday battery applications.
This differs from current (charge flow rate in amperes) or resistance, focusing solely on energy per charge.
Practical Examples
- Batteries : A 1.5 V cell provides 1.5 joules per coulomb between terminals, powering devices like flashlights.
- Circuits : Voltage drives electrons; without it, no sustained current flows despite charge presence.
- Historical Note : Alessandro Volta coined "volt" in the 1800s, linking it to his pile battery's charge-separating work.
Why It Matters
Understanding voltage prevents overloads in wiring and explains lightning (millions of volts between clouds and ground).
In January 2026, with rising electric vehicle adoption under President Trump's energy policies, this concept underpins efficient power systems.
TL;DR : It's voltage—work per coulomb, essential for all electric tech.
Information gathered from public forums or data available on the internet and portrayed here.