Photoelectric effect and gutenberg printing press: what they have in common

1. Step 1. Photoelectric effect — works like — Photovoltaic effect. The internal and external photoelectric effects.
2. Step 2. Photovoltaic effect — is used in — Xerography. A photoconductive drum.
3. Step 3. Xerography — is used in — Laser printer. The principle of xerography.
4. Step 4. Laser printer — is a kind of — Printer. A printer.
5. Step 5. Printer — works like — Gutenberg printing press. A printer is a personal printing press: it transfers an image onto paper.

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