What principle do solar panels use? By Kalsoom Tahir 🌐 Source Environment and Conservation Knowledge Base ✅ Fact Checked 📊 Difficulty Medium 📅 Last Updated 13 Aug 2026 A. Doppler B. Greenhouse C. Photovoltaic Effect D. Piezoelectric Check Answer 💡 Explanation: Solar cells convert light directly into electricity via the photovoltaic effect. 📚 Topics: Environment and Conservation Renewable Energy 🎯 Exams: CSS GEN NTS PMS