Photovoltaic effect and headphones: what they have in common

1. Step 1. Photovoltaic effect — is used in — CCD sensor. Light generates charge in the cells.
2. Step 2. CCD sensor — is part of — Digital camera. The first ones used CCDs.
3. Step 3. Digital camera — has part — Flash memory. A memory card.
4. Step 4. Flash memory — is part of — MP3 player. Flash memory.
5. Step 5. MP3 player — has part — Headphones. Headphones.

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