Electric Charger

Electric Charger
what are the materials for the science project named electric charger?


You need to make an assumption that your project is to demonstrate how a battery is charged.
Get these materials:
1. a DC power supply of the type used to power small electronic devices.
2 an assortment of resistors, low values
3 a small VOM meter, with a DC current scale
4 some rechargable batteries, not Li-on.
5 an LED or flashlight bulb
about 6 alligator clips
What to do:
Cut off the DC connector and peel back the insulation.
Find out what side is plus and ground using the meter (voltage).
You need to connect the ground of the power supply to the ground of the battery. Alligator clips work.
Connect the plus wire to the resitor and through it, through the meter, to the plus side of the battery.
The current should read between 20 mA and 200 mA and the battery should get a little warn, but not hot.
You should measure the battery voltage at the start, then charge it at about 100 mA. Then check it again and you see it got charged, because the voltage went up.
Then you can show the discharge of the battery as it lights the light or the LED.
If the current is too high then try a larger value of resistor. Measure resistors with the ohms scale of the meter.
If the current is too low change to a resistor with fewer ohms.
Charging works best if the power supply voltage is a bit higher than the battery you choose. Experiment with as many as you can get. Expect to recycle them when you are done.

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