Physics · Magnetic Effects of Electric Current

What is the primary safety function of the green insulated earth wire in a domestic circuit, particularly for metallic appliances?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1To provide a low-resistance conducting path for leakage current to ensure the appliance potential equals that of the earth, preventing severe shocks✓
2To act as the neutral wire when the black wire fails
3To stabilise the voltage at 220 V
4To provide a high-resistance path to divert excess current into the ground

Correct answer

To provide a low-resistance conducting path for leakage current to ensure the appliance potential equals that of the earth, preventing severe shocks

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