Im designing a circuit that will monitor a battery condition as its discharged how ever have some problems in getting the load to draw what i want.
Battery is 3v i want the 300ma to be drawn as discharge current so i put in 4 x 10ohm 0.5w 5% tolerance carbon film resistors in this configuration across vs to 0v.
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[]r10 []r10
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[]r10 []r10
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The simulator tells me this draws 300ma with resistance equivalent of 10ohm but when i measure it with a multimeter it draws 165ma which would suggest resistance equivalent of 16.5ohms how can this be ?
Does a resistor resistance change much depending on heat ?
Battery is 3v i want the 300ma to be drawn as discharge current so i put in 4 x 10ohm 0.5w 5% tolerance carbon film resistors in this configuration across vs to 0v.
| |
[]r10 []r10
| |
[]r10 []r10
| |
The simulator tells me this draws 300ma with resistance equivalent of 10ohm but when i measure it with a multimeter it draws 165ma which would suggest resistance equivalent of 16.5ohms how can this be ?
Does a resistor resistance change much depending on heat ?