CIE A Level Physics复习笔记19.1.1 Capacitance
Defining Capacitance Capacitors are electrical devices used to store energy in electronic circuits, commonly for a backup release of energy if the power fails They can be in the form of: An isolate...
CIE A Level Physics复习笔记18.2.3 Electric Potential Energy
Electric Potential Energy of Two Point Charges The electric potential energy Ep at point in an electric field is defined as: The work done in bringing a charge from infinity to that point The elect...
CIE A Level Physics复习笔记18.2.2 Electric Potential Gradient
Potential Gradient An electric field can be defined in terms of the variation of electric potential at different points in the field: The electric field at a particular point is equal to the negati...
CIE A Level Physics复习笔记18.2.1 Electric Potential
Electric Potential In order to move a positive charge closer to another positive charge, work must be done to overcome the force of repulsion between them Energy is therefore transferred to the cha...
CIE A Level Physics复习笔记18.1.5 Electric Force Between Two Point Charges
Coulomb's Law All charged particles produce an electric field around it This field exerts a force on any other charged particle within range The electrostatic force between two charges is defined b...
CIE A Level Physics复习笔记18.1.4 Motion of Charged Particles
Motion of Charged Particles A charged particle in an electric field will experience a force on it that will cause it to move If a charged particle remains still in a uniform electric field, it will...
CIE A Level Physics复习笔记18.1.3 Electric Field Strength
Electric Field Strength The electric field strength of a uniform field between two charged parallel plates is defined as: Where: E = electric field strength (V m-1) ΔV = potential difference betwee...
CIE A Level Physics复习笔记18.1.2 Electric Field Lines
Representing Electric Fields The direction of electric fields is represented by electric field lines Electric field lines are directed from positive to negative Therefore, the field lines must be p...
CIE A Level Physics复习笔记18.1.1 Electric Fields & Forces on Charges
Electric Field Definition An electric field is a region of space in which an electric charge “feels” a force Electric field strength at a point is defined as: The electrostatic force per unit posit...
