Gulliver’s Nutrition
Why did the King of Lilliput serve 1728 meals to Gulliver? This is because the volume of two objects that resemble each other in three dimensions is proportional to the cube of…
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Science simulations
Serial Parallel Circuit 3
Resistance Electrical resistance is a property of a material that impedes the flow of electric current. The unit of resistance is ohm (Ω). When a voltage of 1V is applied, the resistance…
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Dissolution Process
Dissolving Dissolving means that the solute diffuses into the solvent and mixes. It is a common case that salt or sugar is dissolved in water. Solvents are often liquid, mostly water. The…
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Faraday’s Law of Electromagnetic Induction
Electromagnetic induction Moving the magnet around the inductor will change the magnetic field inside the inductor, which will cause current to flow through the inductor. This phenomenon is called electromagnetic induction. The…
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Rectifier Circuit
Diode Diodes are electronic components that pass current in only one direction.The direction in which current can flow through the diode is called ‘forward’, and the direction in which current cannot flow…
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The principle of LED
LED LEDs are electronic devices that emit photons. LEDs have higher efficiency and longer life than bulbs. Basically, LEDs have a structure like a p-n junction diode. The p-n junction diode is…
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Spring Scales
The spring scale is a tool that measures the mass and gravity of an object using the spring’s elastic force. The spring of this scale is lengthened by gravity and shortened by…
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Why the smaller the cell, the larger the area
Cell division Multicellular organisms like humans are made up of cells of varying shapes and functions. Most cells are so small that they can be seen only under a microscope, because once…
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Wrinkles in living organisms
Respiratory organ To maintain life, we absorb oxygen from the air. And we export carbon dioxide from the body. Human respiratory organs include nose, organs, bronchi, lungs. Each bronchus in the lung…
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Conservation of Mechanical Energy
Potential energy The potential energy of an object is the energy stored in an object or system. Denoted as Ep. Generally speaking, potential energy refers to potential energy caused by gravity and…
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