Zhejiang Hantu Electric Co. LTD.

Case Study

Circuit failure and power failure? Teach you to find out why and reappear bright!

Did you suddenly watch TV, and the power went out. Is there a neighbor in the decoration, suddenly quiet down, all the electrical appliances in the home stop working, the food in the refrigerator is slowly melting, your heart is burning with anxiety, sudden blackouts occur from time to time, don't worry, today Hunter electric engineers to teach you how to analyze circuit failure!


Tool preparation: ammeter, voltmeter, conductor, small bulb

Firstly, there are two kinds of circuit faults: short circuit and open circuit. At the same time, we should analyze them according to the specific fault phenomena.




Short circuit. Short circuit is actually very simple.

Firstly, there is a current in the circuit, secondly, if it is a series circuit, then the short-circuit electrical appliances do not work, other electrical appliances work normally; if it is a parallel circuit, the electrical appliances in the circuit do not work.



There are two good ways to find out the location of the short circuit. The first is to connect the voltage meter in different parts, if the voltage is zero, indicating the short circuit. It is important to note that the voltage between conductors is zero, indicating that the conductor is normal.



The second way to judge short circuits is small bulb detection. Connect the small bulb to each part. If the small bulb does not light, it indicates that the appliance is short circuited. It is also important to note that the small bulbs connected to the wires do not emit light, indicating that the wires are normal, because at this time the small bulbs are short-circuited.


Circuit breakers. Without current in the circuit, all the electrical appliances in the series circuit can not work properly; in the parallel circuit, if the trunk circuit breaks, all the electrical appliances do not work, if the electrical appliances in a branch do not work, it means that the branch circuit breaks.



To find out the location of the open circuit, you can use the following four methods. The first is the ammeter detection. The ammeter is connected to each part in parallel. If the ammeter has a reading, the other part can work normally, indicating that the part in parallel with the ammeter has been broken.



The second method is voltmeter detection. If the indicator of the voltmeter is equal to the voltage of the power supply, the circuit breaking occurs in the parallel part. Because at this point, the voltmeter is equal to the series in the circuit, the number increases.



The third method is traverse detection. This is the simplest way. Parallel connection between a section of wire and the two terminals of each part, if the electrical appliances start to work normally, indicates that there is a break in this part.



The fourth method is small bulb detection. If the small bulb lights up and the rest of the bulb starts to work properly, a circuit break occurs.