How big is the resistance of the four color ring on the light controlled nightlight, and one of them

· There are two ways to know.

1. You need to know where the resistor is located in the circuit.

For example, the resistance connected in series at the AC 220V input is generally between 0 2 ohms, you can replace it with a fuse (commonly known as a fuse), but before replacing it, you should check whether there are other burned out parts of the circuit by observing and measuring, otherwise the problem will be amplified.

If it is in other parts, it depends on its role, the size varies greatly, from a few ohms to several trillion ohms are possible, you can look at the components associated with it, roughly judge its role, estimate a resistance range according to experience, try to change it with multiple resistors, when changing, try to start changing it with the maximum value of the estimated resistance, if you can work normally after replacing a certain resistance value, then you should try to increase it, and in the case of meeting the stability of the work and the sensitivity is not affected, the resistance value is as large as possible. If it can't work normally after changing, gradually reduce the resistance value from large to small, and then increase it appropriately after changing it to work normally.

2. If you can find the same lamp, just look at it, this is trouble-free.

!!In general, the burned out resistor is often caused by other faults in the circuit, for example, the common power tube is burned out, resulting in a sharp increase in current, causing the resistor to burn out, especially when the color is not clear. Again, a reminder:

The replacement of the resistor must be carried out after confirming that other parts of the circuit are normal, otherwise, it is easy to expand the fault!