Kirchhoff's Current Law in Normal Appliance Operation

Steps:

• Current flows from the live wire into the cooker, providing power.
• The same current returns through the neutral wire to complete the circuit.
• The earth wire carries no current during correct operation, as it's a safety feature.
• By conservation of charge, incoming and outgoing currents must balance.

Why D is correct:

• Kirchhoff's current law requires the total current entering a device equals the total leaving, so live current equals neutral current in a balanced circuit.

Why the others are wrong:

• A: Earth current is zero, unequal to live current.
• B: Earth current is zero, unequal to neutral current.
• C: Earth current is zero, unequal to live current.

Final answer: D