J
jhleslie@googlemail.com
Guest
I have a 5mm red flashing LED, I've had it for probably 15 years, I
connected some others that I bought at the same time to my house
burglar alarm. They are are on the bell box and on a warning panel on
the garden shed. They make the alarm system look very scary, I think
any potential burglar would move onto another house after seeing
these.
Now I have moved to another house and I want to do the same again, the
problem is that I can't remember how to calculate the resistance that
I need to put in series.
A similar looking item that is for sale here has a specification as
follows,
Forward voltage: 2.5V
Forward current max.: 55mA
I think that this has something to do with V = I x R but I didn't pay
proper attention at school.
Can somebody tell me what a suitable resistance would be please?
Thanks in advance,
James
connected some others that I bought at the same time to my house
burglar alarm. They are are on the bell box and on a warning panel on
the garden shed. They make the alarm system look very scary, I think
any potential burglar would move onto another house after seeing
these.
Now I have moved to another house and I want to do the same again, the
problem is that I can't remember how to calculate the resistance that
I need to put in series.
A similar looking item that is for sale here has a specification as
follows,
Forward voltage: 2.5V
Forward current max.: 55mA
I think that this has something to do with V = I x R but I didn't pay
proper attention at school.
Can somebody tell me what a suitable resistance would be please?
Thanks in advance,
James