hello

i need some help in circuits

if there number of lights in series- say 10- and one of it has a problem
how can i find that light of?

 

In the circuit look for the break in the chain of the lights using a voltmeter, the faulty bulb will have the supply on one side and Zero on the other.

 

To speed things up you can do a sort of "successive approximation" type of test.
Go to the middle bulb first.
If there's power, go to the middle of the lower half (towards common).
If there's no power, go to the middle of the upper half.
Continue this process until you find the failed bulb.

 

To speed things up you can do a sort of "successive approximation" type of test.
Go to the middle bulb first.
If there's power, go to the middle of the lower half (towards common).
If there's no power, go to the middle of the upper half.
Continue this process until you find the failed bulb.

The Quicksort method.

 

The Quicksort method.

That's the word..

 

I have a magic Christmas light sensor. You place a bulb within it's sensor and if there is voltage getting to it it beeps when you press it's button.

When you find the first bulb in the chain that doesn't beep... fit the bulb just before it.

(I call it magic as I have no idea what principle by which it works, but work it does.)

 

If you think the problem is just ONE broken bulb, then you get a new one, then replace the first bulb in the row. If that doesn´t help, you put the bulb you took out instead of the next one. Repeat until it works, or until you reach the end.
If you reached the end wihtout success, then there is either more than one bulb broken or the wiring is bad.