Carbon microphone and electrical grid: what they have in common

1. Step 1. Carbon microphone — is made of — Carbon. Carbon granules.
2. Step 2. Carbon — is used in — Hall–Héroult process. The electrodes for smelting aluminium are carbon — they slowly burn away.
3. Step 3. Hall–Héroult process — uses — Electrical grid. It needs enormous amounts of electricity.

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