I am going to make a simple light that I can turn off and on by a Switch and need some help.
I am going to use a Lead as my Light Sorce and it needs 40 mA at 2. Volts to work.
And I will be useing a 9 Volt Battery for my Power Sorce.
Ok here is the thing I need help with?
I know how to use Ohms Law to findout the Resistance I will need but I don't know how many mA a 9 Volt Battery has???
I meen befor I hock it up to the Lead?????
I am going to use a Lead as my Light Sorce and it needs 40 mA at 2. Volts to work.
And I will be useing a 9 Volt Battery for my Power Sorce.
Ok here is the thing I need help with?
I know how to use Ohms Law to findout the Resistance I will need but I don't know how many mA a 9 Volt Battery has???
I meen befor I hock it up to the Lead?????