O-LevelPhysicsElectricity5054/11 · Oct/Nov 2017 · Q331 Mark
Why are the metal casings of electrical appliances earthed?
Ato complete the circuit
Bto ensure the casing is not at a dangerous voltage
Cto ensure the fuse blows when the current in the appliance is too large
Dto protect the appliance from overheating
✓ Correct answer
B: to ensure the casing is not at a dangerous voltage
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