When Light Cuts suddenly, you need something Powerful yet handy which will Brighten your place at Cheapest possible cost !!!!
Step 1: Parts You Needed
1. 4V Lead-Acid Battery
2. 3W LED
3. slide switch
4. resistor 2.2R /1W
5. connector for charging (as per your choice)
Step 2: Circuit Diagram
Make connections as per the circuit diagram.
And you are done !
As i mensioned this small project will cost you just around 50/- indian rupees OR less than A dollar !
Charge it with 6V (500mA adapter max.) for 3-6 Hrs.