Question

What is the use of fuse in domestic electric circuits? How is its role different from the role of a green coloured wire given in domestic electric circuits? What will happen if an electrician installs a fuse with higher-rated value than prescribed for a given electric circuit?

Accepted Answer

1. **Use of Fuse:** Protects electrical appliances and circuits from overloading and short-circuiting by melting and breaking the circuit when current exceeds safety limit. 2. **Difference from Green (Earth) Wire:** - **Fuse** prevents excessive current flow through live wire by melting. - **Green Wire (Earth Wire)** provides a low-resistance conduction path to ground, protecting users from severe electric shock in case of current leakage to metallic appliance bodies. 3. **Higher-rated fuse installation:** The fuse wire will not melt even if excess current flows during short circuit/overloading, potentially damaging appliances and causing electrical fire hazards.

Role of fuse and earth wire in domestic circuit

Explanation

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