ࡱ> <>;5@ bjbj22 aXX 8&...8fD& Rx4yDyDyDQQQQQQQ$RRIU~QDYB yDDDQ$QFFFDQFDQFFG:L,JRM~ 2\u.EFL N|Q0 RMRUEURM$URMyDDFD DSyDyDyDQQ&& $F&& Resistors and Ohms Law Resistor SHAPE \* MERGEFORMAT Variable Resistor SHAPE \* MERGEFORMAT  SHAPE \* MERGEFORMAT Preset resistor SHAPE \* MERGEFORMAT Fuse SHAPE \* MERGEFORMAT Thermistor SHAPE \* MERGEFORMAT Light Dependent R SHAPE \* MERGEFORMAT Push to make switch SHAPE \* MERGEFORMAT Push to break switch SHAPE \* MERGEFORMAT Single pole single throw, normally open SHAPE \* MERGEFORMAT Single pole single throw, normally closed SHAPE \* MERGEFORMAT Single pole double throw switch SHAPE \* MERGEFORMAT Double pole double throw switch SHAPE \* MERGEFORMAT  The colour code for resistors is shown below, as is the basic formula for Ohms Law. Al the devices above obey Ohms Law. If their resistance increases, so will the voltage across them if the current through them remains the same. If the voltage remains the same, then the current through the device will decrease if its resistance increases. Use the colour code to give the nominal value and tolerance of the following resistors:  Red Yellow Orange Gold Tolerance Blue Grey Red Silver Tolerance Brown Green Brown Gold Tolerance What colour code would you look for if you need 1.2k 56k 47R E12 series: 10, 12, 15, 18, 22, 27, 33, 39, 47, 56, 68, 82. Using Ohms Law, work out the missing item: Current=100mA, Voltage= 10v, Resistance= Voltage=9v, Resistance= 1k, Current= Resistance= 330R, Current=20mA, Voltage= Current=14mA, Voltage=7v, Resistance= Write down the nearest E12 series resistor for the 2 questions above. Voltage Dividers Write down the approximate resistance of the following components: ComponentResistanceComponentResistanceLDR brightly litLDR in the darkThermistor hotThermistor coldspst switch openspst switch closedMoisture sensor wetMoisture sensor dry10k variable at max10k variable at min A potential divider circuit consists of two components put in series across a voltage source. They divide the voltage into smaller parts. In the diagram two resistors are in series across a battery. They divide the 9 volts of the battery so that the output voltage is smaller. Here, because the resistors have the same value, they divide the voltage in half. If you use different resistors, or variable resistors, you can get exactly the output voltage you want. This is very important in electronics. The formula for finding the output voltage is quite simple. Because the current is the same through both resistors, using Ohms Law, we can say:  or You can either remember the formula or use ratios for the calculations. Potential divider circuits can be used with all kinds of sensors for the input to a system. 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