Library

From the size of an atom to the distance between the Earth and the Sun, learn how to write and compare very large or very small numbers using scientific notation and orders of magnitude.

Learn how to analyse any electrical circuit using Kirchhoff’s two laws: the law of current conservation at nodes and the law of energy conservation along loops.

Learn how to read and use unit prefixes (kilo, milli, centi, etc.) to easily convert measurements of length, mass and time.

Understanding why a thrown ball follows a curved path, and calculating its range and maximum height: this lesson breaks down the motion of projectiles into two simple movements that can be combined.

Discover how a simple glass lens can cause light to converge or diverge, and learn how to construct it and calculate the position, size and nature of the images it forms.

Find out how to describe, represent and measure the forces acting on the objects around us, from a rolling ball to a falling apple.

Discover how four equations, formulated in the 19th century, unify electricity, magnetism and optics and predict the existence of electromagnetic waves.

Find out how to calculate an equivalent resistance and distribute voltages and currents in a circuit, whether the resistors are connected in series or in parallel.

Find out how a force transfers energy to a moving object, from the formula for work to its practical applications, such as free fall and braking a vehicle.

Understand how a simple three-terminal component can control currents and amplify signals: from the physics of junctions to calculating the gain of a common-emitter stage.

Why does a suitcase slide forwards when the train brakes? This lesson explains the principle of inertia – Newton’s first law – using real-life examples and highlighting common pitfalls to avoid.

Learn how to describe motion, calculate speed and recognise uniform linear motion using everyday examples and simple graphs.

Understanding why a planet, a merry-go-round or a car on a bend can travel at a constant speed whilst being constantly accelerated: a paradox that isn’t really a paradox.

Find out how the electricity that powers your sockets works: sinusoidal voltage, frequency, root mean square (RMS) value and how the domestic electricity supply works.

Discover the capacitor – a component capable of storing electrical charges and releasing that energy in an instant: its structure, capacitance, charging and discharging, and practical applications such as camera flashes and defibrillators.

Understand the transient and sinusoidal behaviour of the RL dipole: current rise and fall, time constant, magnetic energy and complex impedance.

Find out how electricity flows through a torch or a string of Christmas lights, and learn how to draw and read simple electrical circuit diagrams.

Find out how magnets, the Earth and electric currents create a magnetic field, and learn how to calculate its effects using Laplace’s force.

Find out how an electric charge affects its surroundings from a distance, and learn how to calculate, represent and analyse electric fields, whether uniform or non-uniform.

Find out why every action causes a reaction, and understand how this law explains walking, rockets and everyday collisions.

Find out what electrical voltage is, how to measure it with a voltmeter, and how it behaves in a series or parallel circuit.

Understand how a fluid exchanges pressure energy, kinetic energy and potential energy along a streamline, and discover the applications (Venturi, Pitot, Torricelli) as well as the limitations of this fundamental result in fluid mechanics.

Why does a straw look as if it’s broken when it’s in a glass of water? Discover Snell–Descartes’ laws, which explain how light changes direction when it passes from one medium to another.

Find out why you can see yourself in a mirror and how light bounces off objects: a simple lesson, illustrated with everyday examples, to help you understand the laws of reflection.