Varistor and solar panel: what they have in common

1. Step 1. Varistor — is made of — Semiconductor. A varistor is zinc oxide or silicon carbide.
2. Step 2. Semiconductor — is used in — Photovoltaic effect. A p–n junction separates the charges.
3. Step 3. Photovoltaic effect — is used in — Solar panel. The photoelectric effect in a semiconductor.

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