A place to help you with technology, science and mathematics.
I always wanted to share the beauty of time with everyone. Here is a set of great videos that explain space-time in a very simple yet effective manner. A special thanks to ted-Ed for making such wonderful videos.
This post will be the concluding post for resistors. In this post I will mainly concentrate on reading the value of a common resistor. This post should have been the second post in the resistor series but as I was keener in going into the math and principle behind resistors, I completely forgot to write this post.
As resistors are very small, printing their values on them was too difficult and costly in the olden times. Hence they resorted to print colored bands on the resistors that later could be used to interpret their values. There are usually four bands on a resistor. The first band gives us the first digit of the total resistance. The second band gives the second digit of the resistance. The third band gives the number of zeros. The fourth band tells us the percentage by which the actual resistance of the resistor would vary compared to the printed value.
For resistors with 5 or 6 bands, you can use this chart to interpret their values.
I was inspired by Jarvis from the Iron Man and strongly wanted a home automation system. The existing systems were not cheap so I decided to build my own home automation system using an Arduino. At present its functionality is limited to switching the devices on or off but it can process natural language at a very basic level that allows you to use this technique to incorporate natural language processing capabilities into other Arduino projects.
CAUTION: I DID NOTtest this project with real world appliances and if you are planning to do so, do it at your own risk. I strongly advice a professional electrician's help in doing so.
The project is fairly simple in terms of the things required. ArduinoBluetooth Module (Preferably HC-05)LEDs (For prototyping) x 4BC-547 transistors x 410k and 150 ohms resistors x 4 eachRelay Board (Optional, only if you are serious about installing Jarvis in your home)Power supply (I used a powerbank and a 9V battery)Wires and BreadboardAn Android phone …
Photoelectric effect is one of the most fascinating yet simple phenomenon in physics. Heinrich Hertz carried out the experiment in which he took a tube and placed two electrodes in it. He then connected them to a power source. He coated the cathode with cesium metal as it has a low ionization energy, which means less energy is required to free the electrons. When sunlight was allowed to fall on the cathode, there was current in the circuit. The number of electrons the were freed depended on the intensity of the incident light whereas the energy required to free the electrons from the atom depended on the frequency of the incident radiation.
Photoelectric effect could not be explained by considering light in the form of a particle or a wave or electromagnetic radiation. In order to explain black body radiation Max Plank, a German theoretical physicist, considered light as a form of electromagnetic radiation composed of photons. This assumption helped him to explain black body radiation…