Photoelectric effect and telephone: 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 — Photodiode. Light generates a current in the junction.
3. Step 3. Photodiode — is used in — Fax. Scanning with a photocell.
4. Step 4. Fax — uses — Telephone. Transmission over a telephone line.

Open Evothings