awak3n Posted January 10, 2006 Report Share Posted January 10, 2006 Hi,I am pretty knew to electronics but I am having trouble finding the calculation to know what amount of resistance to use. (Ex. I have 280V and would like to make it 100V, how much resistance would I need?)Thanks,awak3n Quote Link to comment Share on other sites More sharing options...
audioguru Posted January 10, 2006 Report Share Posted January 10, 2006 A resistor reduces a voltage by dividing the voltage with another resistor.Reducing voltage with resistors causes them to heat. The heat is waste. If the current is high then since you want to reduce the voltage a lot, the resistors will become extremely hot.It might be best to make a power supply for 100V. Quote Link to comment Share on other sites More sharing options...
MP Posted January 21, 2006 Report Share Posted January 21, 2006 awak3n,Here is a voltage divider calculator. This makes learning the formula more fun.http://hyperphysics.phy-astr.gsu.edu/hbase/electric/voldiv.htmlMP Quote Link to comment Share on other sites More sharing options...
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