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Hello Everyone,I am trying to make a circuit by using LDR, 548 Transistor, 5V battery, LED. I want that LED should turn on when the LDR sense dark but in my system it's reverse. Could anyone please tell me why it's happening. I am not using any register. Should I use on it. If I should, please tell me why I should use register and how may I measure that what ohms register will be used.Thanks