Subelement A: Principles— Topic 1: Electrical Elements
Question 3-1A3
Element 3 (GROL)What is the term used to express the amount of electrical energy stored in an electrostatic field?
Explanation
The amount of electrical energy stored in an electrostatic field is expressed in **Joules**. A Joule is the standard SI unit of energy, representing the work done or the energy expended when a force of one Newton is applied over one meter. In electrical terms, it signifies the capacity to do work, such as the energy stored in a capacitor's electrostatic field.
* **B) Coulombs** are units of electric charge, not energy. One Coulomb represents the charge of approximately $6.24 \times 10^{18}$ electrons.
* **C) Watts** are units of power, which is the *rate* at which energy is transferred or consumed (Joules per second). They do not measure stored energy.
* **D) Volts** are units of electric potential or potential difference (electromotive force). One Volt is defined as one Joule per Coulomb, indicating the energy per unit charge, not the total energy stored.
Related Questions
3-1A1 The product of the readings of an AC voltmeter and AC ammeter is called:3-1A2 What is the basic unit of electrical power?3-1A4 What device is used to store electrical energy in an electrostatic field?3-1A5 What formula would determine the inductive reactance of a coil if frequency and coil inductance are known?3-1A6 What is the term for the out-of-phase power associated with inductors and capacitors?