Making computers possible, transistors were invented in 1947. They are used as switches and amplifiers in circuits and are key to controlling flow of current.
Solar cells convert light energy into electrical energy using what is known as the photovoltaic effect, using the fact photons are absorbed by electrons when incident on a metal surface. [Read more…] about Solar Cells – Applying the Photovoltaic Effect
With energy demand constantly increasing and the supply of fossil fuels going down, finding an alternative source of energy is required. Fusion is the process which powers the stars but could soon be used to generate electricity on Earth. [Read more…] about Nuclear Fusion: The Future Of Electricity Generation?
Superconductors are materials which can conduct electricity with no resistance and they also behave in a unique way in magnetic fields. By why does cooling certain materials cause this effect? [Read more…] about Superconductors
LEDs are a type of diode, which emit light when an electric current is passed through them. They are made of semiconducting materials, which only allow current to flow one way. The movement of electrons to different energy levels is the reason for the light being emitted. [Read more…] about How Do LEDs Work?
The space pen is a specially designed pen that can work in zero-gravity, underwater and at lots of temperatures. A regular pen requires gravity in order to work, so in zero-gravity situations such as on the space station, they cannot work. So how does the space pen work without gravity? [Read more…] about How Do Zero-Gravity Pens Work?