Interactive Simulators

Ohm's Law Explorer

Change voltage and resistance and watch current respond as V = IR.

Resistors in Series

Add three resistors in series and see the equivalent resistance grow.

Resistors in Parallel

See why parallel resistance is always smaller than the smallest resistor.

Joule's Heating Effect

Explore H = I²Rt and understand why fuse wires melt.

Electricity Bill Calculator

Convert appliance power into commercial units (kWh).

Charge, Current & Electrons

Relate current to the number of electrons flowing.

Resistivity of a Wire

R = ρL/A — see how length and thickness change resistance.

Potential Difference & Work

Work done in moving charge through a potential difference.

LED vs Incandescent Bulb

Compare energy use and savings for the same brightness.

Light – Reflection and Refraction (5)

Mirror Formula Simulator

Move the object and see image position, magnification and nature.

Lens Formula & Power

Use 1/v − 1/u = 1/f for convex and concave lenses.

Snell's Law Bench

Bend a light ray between two media and find the refraction angle.

Concave Mirror Image Table

Place the object at standard positions and read the image formed.

Magnification Playground

Link object height, image height and magnification.

The Human Eye and the Colourful World (4)

Eye Defect Corrector

Find the corrective lens power for myopia and hypermetropia.

Prism Dispersion Lab

See how each colour deviates differently through a prism.

Tyndall & Sky Colour

Rayleigh scattering ∝ 1/λ⁴ explains the blue sky and red sunset.

Combining Lens Powers

Powers add up when thin lenses are placed in contact.

Magnetic Effects of Electric Current (6)

Solenoid Magnetic Field

Change turns and current to strengthen an electromagnet.

Fleming's Rule Trainer

Pick directions of current and field and predict the force direction.

Force on a Current-Carrying Wire

F = BIL sinθ — see when force is maximum.

Domestic Circuit Safety

Choose appliances and check whether the fuse blows.

Electromagnetic Induction

Faraday's law: change flux faster to induce a bigger EMF.

Electric Motor Torque

See how turns, current and field affect the turning effect.

Sources of Energy (1)

Energy Source Comparison

Compare output and pollution of different energy sources.

Chemical Reactions and Equations (5)

Equation Balancer

Adjust coefficients of H₂ + O₂ → H₂O until atoms match on both sides.

Reaction Type Identifier

Pick a reaction and identify its type and energy change.

Mass ⇄ Mole Converter

Convert between mass, moles and number of particles.

Oxidation & Reduction Tracker

Identify what is oxidised and reduced in a redox reaction.

Rancidity Preventer

Store food differently and see how long it stays fresh.

Acids, Bases and Salts (7)

pH Scale Explorer

Slide through the pH scale and see indicator colours and H⁺ concentration.

Strong vs Weak Acid

Compare ionisation of acids at the same concentration.

Titration / Neutralisation

Add base to acid and find the end point.

Salt Family & pH

Combine an acid and a base and predict the salt's nature.

Water of Crystallisation

Heat hydrated salts and track the water lost.

Antacid Action

Neutralise stomach acid and watch the pH recover.

Chlor-Alkali Products

Electrolyse brine and trace where each product goes.

Metals and Non-metals (6)

Displacement Predictor

Will metal A displace metal B from its salt solution?

Metal vs Non-metal Sorter

Compare physical properties on the same scale.

Ionic Bond Builder

Transfer electrons between a metal and a non-metal.

Corrosion & Prevention

Change conditions and see how fast iron rusts.

Metallurgy Route Chooser

Pick a metal and see the correct extraction route.

Alloy Composition Lab

Mix metals and see the alloy formed and its properties.

Carbon and its Compounds (7)

Hydrocarbon Formula Builder

Build alkanes, alkenes and alkynes from carbon count.

Functional Group Lab

Attach a functional group and read its name and property.

Homologous Series Trend

Watch molecular mass and boiling point rise by a fixed step.

Soap, Micelles & Hard Water

See why soaps fail in hard water and detergents don't.

Ethanol & Ethanoic Acid Reactions

Choose a reagent and predict the product.

Combustion of Hydrocarbons

Balance oxygen supply and observe the flame.

Esterification Reactor

Tune temperature and catalyst to maximise ester yield.

Life Processes (6)

Photosynthesis Rate Lab

Change light, CO₂ and temperature to find the limiting factor.

Aerobic vs Anaerobic Respiration

Compare ATP yield and products for the same glucose.

Heart & Circulation

Change heart rate and stroke volume to see cardiac output.

Nephron Filtration Lab

Adjust water intake and see urine output and concentration.

Digestive Enzyme Matcher

Pick a region of the gut and see which enzyme acts there.

Transpiration Pull

Change weather conditions and see water loss from leaves.

Control and Coordination (3)

Reflex Arc Timer

Compare a spinal reflex with a conscious brain response.

Hormone Function Matcher

Select a hormone and see its gland, function and deficiency.

Tropism Simulator

Apply a stimulus and see which way the plant part bends.

How do Organisms Reproduce (3)

Asexual Reproduction Explorer

Choose an organism and see its method of reproduction.

Flower & Fertilisation

Trace the path of the pollen grain to the ovule.

Menstrual Cycle Timeline

Move through the 28-day cycle and see what happens each day.

Heredity (4)

Punnett Square Cross

Cross two parents and read the genotype and phenotype ratio.

Sex Determination in Humans

See how the father's chromosome decides the child's sex.

Trait Inheritance Probability

Check the chance of a recessive trait appearing in children.

Natural Selection Simulator

Change the environment and watch allele frequency shift.

Our Environment (4)

10% Energy Flow Law

Follow energy through trophic levels in a food chain.

Biomagnification Tracker

Follow a pesticide as it concentrates up the food chain.

Biodegradable or Not?

Sort waste and see how long it takes to decompose.

Ozone Depletion Model

Change CFC emission and see ozone thickness over time.

Real Numbers (5)

HCF & LCM Machine

Find HCF and LCM of two numbers and verify HCF × LCM = a × b.

Prime Factorisation Tree

Break any number into its unique prime factors.

Euclid's Division Algorithm

Run a = bq + r step by step to reach the HCF.

Terminating or Recurring?

Check whether a fraction gives a terminating decimal expansion.

Rational or Irrational?

Check whether √n is rational and see its decimal expansion.

Polynomials (2)

Quadratic Graph Explorer

Change a, b, c and watch the parabola and its zeroes move.

Degree & Number of Zeroes

See how the graph shape depends on the degree.

Pair of Linear Equations (3)

Pair of Linear Equations Solver

Solve a₁x + b₁y = c₁ and a₂x + b₂y = c₂ and see the graphical meaning.

Consistency Ratio Checker

Compare a₁/a₂, b₁/b₂ and c₁/c₂ to classify the system.

Straight Line Grapher

Change slope and intercept to see how the line moves.

Quadratic Equations (3)

Nature of Roots

Use the discriminant to classify roots before solving.

Completing the Square

Convert ax² + bx + c into vertex form step by step.

Speed–Time Word Problem

A classic train problem solved live as you change the numbers.

Arithmetic Progressions (4)

AP nth Term Finder

Generate an AP and jump to any term instantly.

Sum of an AP

Sₙ = n/2 [2a + (n−1)d] — check it against direct addition.

Is it an AP?

Enter four terms and test for a common difference.

Savings Plan as an AP

Save a fixed extra amount each month and track the total.

Triangles (3)

Similar Triangles & BPT

Use the Basic Proportionality Theorem to find the missing side.

Area Ratio of Similar Triangles

Areas are in the ratio of the squares of corresponding sides.

Pythagoras Theorem Checker

Test whether three sides form a right triangle.

Coordinate Geometry (3)

Coordinate Geometry

Distance Formula Plotter

Move two points and measure the distance between them.

Coordinate Geometry

Section Formula Divider

Divide a line segment in a given ratio m : n.

Coordinate Geometry

Area of a Triangle (Coordinates)

Drag vertices and check for collinearity.

Introduction to Trigonometry (3)

Trigonometric Ratio Lab

Change the angle and read all six ratios of a right triangle.

Identity Verifier

Verify sin²θ + cos²θ = 1 and its companions for any angle.

Complementary Angle Relations

Check sin(90° − θ) = cos θ and friends.

Some Applications of Trigonometry (2)

Height & Distance Finder

Use the angle of elevation to compute the height of a tower.

Angle of Depression

Look down from a cliff and find how far away the boat is.

Circles (1)

Tangent Length Calculator

Find the tangent length from an external point.

Areas Related to Circles (2)

Circle Area & Circumference

Change the radius and compare area with circumference growth.

Sector & Segment Areas

Sweep the angle and split the circle into sector and segment.

Surface Areas and Volumes (4)

Combination of Solids

Build a cylinder with hemispherical ends and get its volume and surface area.

Frustum of a Cone

Cut a cone and measure the frustum formed (like a bucket).

Melting & Recasting

Melt a sphere into small cones and count how many you get.