Electronics > Beginners
charge a super capacitor
StillTrying:
You might have to believe in Ohms Law, to see how you can limit the current to safe levels.
www.allaboutcircuits.com/textbook/experiments/chpt-2/ohms-law
"But how can I test the power adapter to see if it will put out 500mAs?"
If you had a 6 Ohm 2 Watt resistor you could put it across the 3V output, then 3V/6R = 0.5 Amps would flow, and the resistor would get quite warm.
A 6.8 Ohm 2 Watt resistor in series with the 3V and super cap would limit the charging current to 440mA, you'd still have to watch that the cap doesn't eventually charge to over 2.6V, charging will be slow towards the end.
You might be able to use a small 6V bulb instead of a resistor to limit the cap charging current down to ~0.5A.
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