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A Level Physics


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Centre of Mass

An object may be made to balance at a particular point. When it is balanced at this point, the object does not turn and all the weight on one side of the pivot is balanced by the weight on the other side. This point is called the centre of mass, or centre of gravity, of the object.


In this article, the fundamentals of electric charge, current, potential difference, resistance and conservation of charge are discussed.

Classification of Particles

Subatomic particles are classified based on their mass, type of interaction and electrical charge. Classification based on the mass of the particles is the most basic way of understanding the subatomic particles. 

Collisions of Electrons With Atoms

An electron is a subatomic particle with finite mass and negative electric charge. Electron orbits the nucleus of an atom. 

Conditions For Equilibrium

An object is said to be in equilibrium if the resultant force acting on the object is zero or the sum of the moments acting on the object is zero. This article discusses the methods to find out force equilibrium.

Conservation of Energy

All energy changes are governed by the law of conservation of energy. The law states that energy cannot be created or destroyed. It can only be converted from one form to another.

Constituents Of The Atom

The atoms of all elements are made up of three particles called protons, neutrons and electrons. The protons and neutrons are at the centre of the atom. The centre of the atom is called a nucleus. 

Current Electricity

Electricity is a set of physical phenomena associated with the presence of motion of electric charge. Electricity has various uses in everyday life. It is one of the easiest ways to convert energy.

Current Voltage Characteristics

In this article, the relationship between current and voltage for an ohmic conductor, semiconductor diode and filament lamp is discussed. Ohm’s law is also discussed.

Current, Charge & Potential Difference

Matter is made of tiny particles called atoms. An atom consists of protons, neutrons and electrons. Normally, the number of protons and electrons are equal and the overall charge of an atom is zero.

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