[ [ SION: QUESTIONS: Answer the following questions: 1. Explain the color coding of resistors? 2.Give one example each for a Diode made of Silicon Semiconductor (SC) material & a Diode made of Germanium SC material? 3. Explain the working of the OR gate circuit using Diodes? 4. Explain the working of the AND gate circuit using Diodes?
1 ) The color code is given by several bands. Together they specify the resistance value, the tolerance, and sometimes the reliability or failure rate. The number of bands varies from three to six. At a minimum, two bands indicate the resistance value and one band serves as multiplier. The resistance values are standardized; these values are called preferred values.
some general tips for reading the color code:
The reading direction might not always be clear. Sometimes the increased space between bands 3 and 4 provide an indication of the reading direction. Also, the first band is usually the closest to a lead. A gold or silver band (the tolerance) is always the last band.
It is a good practice to check the manufacturer’s documentation to be sure about the color coding system used.
When in doubt, measure the resistance with a ohmmeter. In some cases this might even be the only way to figure out the resistance; for example when the color bands are burnt off.
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