Why does a light bulb glow brighter when you increase the voltage? Why does a circuit draw more current when its resistance is reduced? These questions can be answered with one of the most important relationships in basic electricity: V = IR. Known as Ohm’s Law, the equation connects three fundamental electrical quantities: voltage, current,…
Snell’s law n₁sinθ₁ = n₂sinθ₂ explains refraction at boundaries. Refractive index, critical angle, total internal reflection, and fibre optics explained with worked examples.
Electric charges can influence objects around them without physically touching them. A charged particle can push or pull another charge from a distance, and this interaction is described using two important concepts in electrostatics: electric field and electric potential. The electric field describes the force that a charge would experience at a particular location, while…
What happens to the energy of a roller coaster as it climbs a hill and then races downward? It does not simply disappear. Instead, energy shifts between different forms, especially kinetic energy and potential energy. This everyday example provides a simple way to understand mechanical energy. Mechanical energy is the energy an object has because…
Light from the Sun, radio signals, Wi-Fi, X-rays, and microwaves may seem completely different, but they all belong to the same family: electromagnetic waves. These waves can travel through empty space without needing air, water, or another material medium. Electromagnetic waves are waves made of oscillating electric and magnetic fields that propagate through space. In…
The Carnot cycle explained: maximum possible heat engine efficiency, eta = 1 – Tc/Th, the four-stage cycle, and why no real engine can beat it. Worked examples.
Kinetic molecular theory: how molecular motion creates pressure and temperature. Covers the 5 postulates, RMS speed, and ideal gas law derivation.
Four quantum numbers n, l, m_l, m_s describe each electron state. Principal, angular momentum, magnetic, spin. Pauli exclusion principle and electron configuration explained.
What happens when an object falls through the air? At first, it may speed up rapidly, but after some time, its acceleration can decrease until it moves at a constant speed. This change in motion is explained by two important physics concepts: free fall and terminal velocity. Free fall describes motion under the influence of…
How momentum is conserved in collisions — the key difference between elastic and inelastic impacts, the impulse-momentum theorem, and worked examples.
