In a LED, a device known as a light-emitting diode ( a semiconductor diode ) produces light when receiving a certain level of current. A semiconductor diode is a device which allows current to flow in one direction, called the forward direction. When a potential difference (p.d.) is applied in the forward direction, current flows through the LED and it glows. No current flow is observed when the p.d. is in the reverse direction. LEDs do not have filaments to burn out or break.
A short circuit in an electrical circuit is one that allows a current to travel along a path where essentially no (or a very low) electrical resistance is encountered.
An open circuit occurs when there is a break in the circuit to stop the current from flowing. Breaks in the circuit can be due to many reasons, such as a loose lamp holder, an open switch or a missing wire in the circuit.
One wire coil is connected to a radio, and another is connected to a speaker. The two coils are not connected to each other. The radio signal is transmitted through the induced magnetic field caused by the current in the wires. The signal is only received when there is a magnetic flux through the receiving coil, and thus no sound is heard when the coils are perpendicular to each other.
Mousetrap car? What is it? Some people might have wondered what exactly the Mousetrap car is. It is a physics project in which students design and construct a vehicle with single mousetrap as its sole source of propulsion. A mouse-trap car is powered by the energy of a wound up mouse-trap's spring. Energy stored in the spring would cause the vehicle to travel in distance if it was under good construction.
Physics is a natural science; it is the study of matter and its motion through space time and all that derives from these, such as energy and force. More broadly, it is the general analysis of nature, conducted in order to understand how the world and universe behave.