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Activities/Turtle Art/Using Turtle Art Sensors (view source)
Revision as of 04:07, 5 December 2010
, 04:07, 5 December 2010→Measuring DC Amps
The laptop was charged from a fully discharged state while turned off. The voltage delivered to the laptop was only (11.46 -0.7)V because of losses across the current measuring resistor and the protection diode. The plot has a scale of 0.5V/square /0.8 ohms = 6.25 amps/square and 1200 seconds/square or 20 minutes per square. The full charge took 156 minutes at 7.75 amps. The minimum voltage the XO1.5 can measure is 0.17V corresponding to 0.21 amps.
The laptop was charged from a fully discharged state while turned off. The voltage delivered to the laptop was only (11.46 -0.7)V because of losses across the current measuring resistor and the protection diode. The plot has a scale of 0.5V/square /0.8 ohms = 0.625 amps/square and 1200 seconds/square or 20 minutes per square. The full charge took 156 minutes at 0.775 amps. The minimum voltage the XO1.5 can measure is 0.17V corresponding to 0.21 amps.