Capacitive touch screen
touch screen The touch screen is a technology that allows you to use IT devices more intuitively by clicking or dragging the desired location on the screen. There are several types of touch screens depending on … more
Electricity & Magnetism Simulation
Transistor application circuit
The above simulation is based on a circuit that actually works. The transistor uses C1815(general-purpose NPN switching transistor). The resistance connected to the base is 100kΩ, and the resistance connected to the emitter is 100Ω. Transistor … more
Structure of an ammeter
Ammeter The strength of the current in the electrical circuit is measured using an ammeter. There is a rotor with a coil wound inside the ammeter. When the current flows through the ammeter, the coil and … more
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 the ohm(Ω). When a voltage of 1V is applied, the conductor’s resistance that allows a … more
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 through the diode … more
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 made by attaching a … more
Homopolar Motor
Assuming that the current flowing in the wire is in the X-direction, the magnetic field is in the Y direction. Then, what direction is the electromagnetic force? ‘Homopolar motor’ refers to a motor operated by using … more
Modulation of AM and FM radio
* Above simulation adjusted the amplitude and wavelength for easy observation. * For your understanding, the frequency modulation range of FM broadcasts is exaggerated. Radio frequency The audible frequency is commonly referred to as ‘sound.’ Sound’s … more
Electric Transformer
* We assume an ideal transformer where the excitation current is “0”. Electric transformer A transformer is a device for simply changing the voltage of an alternating voltage (AC). Transformers make it easy to change the … more
Serial Parallel Circuit 2
In parallel circuit, The current splits up when it comes to a branch. The current in all the branches adds up to the current in the main part of the circuit. If one bulb breaks, the … more