Hi everyone! I am trying to find out more about why a voltage drops when you put a load onto the source. Also when using Ohms Law formula what voltage should I use. The V with or without load.
I have a basic battery powered LED strip that uses 3 AA batteries. So, when using voltmeter it shows 4.5 volts without load. However voltage drops to 3.5 when LED is connected. So assuming I know the current, do I use 4.5 or 3.5 to find the resistance, given I know the current.
I've been trying to research it but nothing useful is coming up. All text books and sites simply seem to refer to rated voltage of the battery and do not mention anything about this "drop". I did find more about voltage drop or voltage sag. These appear to be slightly different..
Could someone please either explain me why this happens or let me know what this behavior is called so that I can maybe try to find something relevant.
Thanks!!
I appreciate it!!
I have a basic battery powered LED strip that uses 3 AA batteries. So, when using voltmeter it shows 4.5 volts without load. However voltage drops to 3.5 when LED is connected. So assuming I know the current, do I use 4.5 or 3.5 to find the resistance, given I know the current.
I've been trying to research it but nothing useful is coming up. All text books and sites simply seem to refer to rated voltage of the battery and do not mention anything about this "drop". I did find more about voltage drop or voltage sag. These appear to be slightly different..
Could someone please either explain me why this happens or let me know what this behavior is called so that I can maybe try to find something relevant.
Thanks!!
I appreciate it!!