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Fixed Resistors.        Fixed resistors පිළිබඳ සරල සිංහලෙන් දැනගමු! • Resistance is the opposition for the current flow. • Resistance is measured in ohms ( Ω ) • Fixed resistors have a fix value of resistance. • Circuit Symbols:    • Physical appearance of the resistor :  • Resistance can be measured directly  multimeter   . Steps : ´ Set the multimeter to the resistance range ´ Connect the resistor to the multimeter leads ´ Take the reading on the display ´ Resistance of the resistor can also be calculated using the colour bands printed on the surface of the resistor: ´ Steps  ´ Observe the 1 st 3 color bands of the resistor (starting from the opposite end to silver or gold color band) ´ Each colour represents a number. ´ Combining the numbers we can calculate the resistance value. Example 1 : Example 2 : ´ The 4 th color band gives the tolerance ...
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Dark Sensitive Circuit With C828 Transistor In Sinhala

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අදුරට සංවේදී පරිපටයක් සකස් කර ගන්නා ආකාරය සරල සිංහලෙන්. Dark sensitive circuits have a range of applications such as turning on lights when the light level falls below a certain threshold.In our circuit this threshold is changed by using a variable resistor which can be turned to fine tune the circuit. The circuit consists of the following components: C828 transistor x1 7805 voltage regulator x1 1 kilo ohms resistor x1 LDR x1 LED x1 100 kilo ohms variable resistor.  The base current of the transistor is controlled by the potentiometer.In very low light conditions the ldr will have a very high resistance and in high light conditions the ldr will have a low resistance.In the dark condition less current will flow through the ldr so more current passes through the base of the transistor causing a high current flow through the led via the collector pin of the transistor causing the led to light up but in high light condtions the ldr will have a low resistance there for most...
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How To Power Up a LED From Arduino's 5V Output Explained In Sinhala | 01 Arduino board has given us opportunity to obtain a power output of 5V once its connected to the computer. Its is possible to draw up to about 700 mA from the board safely via the USB Connection. This output can be used for any project that does not consume too much current with or without  the board itself running a code at all.The advantage of this is that you don't need an external power supply to build your simple projects. Arduino board එකේ 5V power output මගින් සරලව LED බල්බයක් දල්වා ගන්නා අයුරු දන්න සිංහලෙන්.    FB Group Link : http://www.facebook.com/groups/vikilabs17 FB Page Link : http://www.facebook.com/vikilabs17/ Presentation : https://drive.google.com/open?id=0B-xkwb9ASKxXSTRUTkhNeFg2TnM
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