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How does a fuse work and what is it for?

Model: (Various brands) Various
Part: Fuse box

Video tutorial

Do we really know what a fuse is for and how it works? A fuse is a safety device that protects electrical circuits from overcurrent (an excess of current). But how does it work? It consists of two contacts connected by an internal conductor wire.

When the current exceeds a certain limit, the wire heats up (producing the so-called "Joule effect", a physical phenomenon where an electric conductor carrying current generates heat due to the friction of electrons in the material) until it melts, breaking the circuit.

Each fuse has a specific response time based on the current.

Once blown, the fuse must be replaced, as the internal conductor is damaged.


Posted on 27 September 2026 by ScegliAuto


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How to enter the radio code in the Opel Zafira?

In the Opel Zafira, it may happen that the radio locks and consequently requests the appropriate security code, especially after disconnecting or replacing the battery. The code can be found in the documents provided at purchase or through one of the various online recovery services. Once obtained, enter it by following the procedure shown in this tutorial. First, switch on the instrument panel, then press and hold both the "AS" button and the left knob for about 5 seconds. Next, enter the first digit by repeatedly pressing the "1" button, continue with the next 3 buttons, and save the setting by pressing the "AS" button again.

Watch the video!


by ScegliAuto

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