Brake pad and voltaic pile: what they have in common

1. Step 1. Brake pad — is part of — Brake caliper. Pads.
2. Step 2. Brake caliper — is part of — Car brake. A caliper.
3. Step 3. Car brake — is part of — Electric car. Besides regeneration, ordinary friction brakes are needed.
4. Step 4. Electric car — has part — Inverter. An inverter powers the traction motor.
5. Step 5. Inverter — uses — Direct current. An inverter turns a battery's direct current into alternating current.
6. Step 6. Direct current — is used in — Voltaic pile. It produces direct current.

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