Semiconductors are commonly known as devices used in electrical and electronics engineering to act as either a conductor or an insulator. One example of these devices are diodes. A diode is a two-terminal device that lets current pass in one direction and blocks it from the other direction. To better understand it, think of resistors. A resistor resists the flow of current to a certain level depending on the value of its "resistance", and it works the same way no matter the polarity of the applied voltage. In the above example, the resistor's value is 100Ω. The voltage applied to it is 100VAC peak-to-peak. I used alternating current (AC) to show the waveform of the current passing through the resistor when applied with positive and negative voltage. As we can see from the waveform, the current passes through the resistor regardless of the polarity of the applied voltage. When the applied voltage is positive*, the current passes through the resistor from its right termina...
I woke up early in the morning and sat at my computer. I was about to study Japanese when I suddenly remembered how I made a perfect star when I was in high school. At that time, I mastered elementary geometry, so I was able to easily make it with a ruler and a protractor. With a ruler to measure length and a protractor to measure angles, it was easy to make a star. A star is a polygon with ten sides. Technically, it is a decagon. But a star can be created by laying out only five lines from its center as its frame. To make a perfect star, all five lines must have the same length and must have equal angles between them. A complete rotation has 360°. To determine the angle from one line to the other, 360° is divided by the number of lines, which is 5. 360° / 5 = 72° From the angle alone, and with a ruler and a protractor, a perfect star can be drawn like so: Draw a line with length x from the center upward. Then, measure 72° from the center to its left and right, and draw the...