Results for “solar energy”

In this chapter Inside a solar cell: the p–n junction. Efficiency: why a panel turns only about a fifth of sunlight into electricity. Inverters, rooftop systems, solar pumps and floating…

…chapter The Sun sets and the wind stops — now what? Batteries: our energy piggy banks. The power grid: a giant web that shares electricity. India’s green energy journey, and meet Iba from…

India is building one of the largest clean-energy systems in the world, and it is being built by people not much older than you. This section is about how you join them — whichever subjects…

…Big Idea The grid must match supply and demand every single second. Solar power peaks at midday, but demand peaks in the evening, and wind rises and falls with the weather. To run mostly on…

In this chapter The physics limit of a single-junction solar cell. Tandem cells, bifacial modules and trackers. Sharing land: agrivoltaics, floating solar and offshore wind. Meet Devika…

…Recap of Advance 1. This chapter revisits the science from Green Energy — Advance 1 and sharpens it with the numbers engineers actually use. In this chapter A fast recap of Advance 1:…

Quick Recap of Basic 2. This chapter revisits ideas from Green Energy — Basic 2 and takes them one step further. In this chapter A fast recap of solar cells, turbines and generators from…

In this chapter What is inside a solar panel? How sunlight turns into electric current — step by step. Solar power on rooftops, in villages and in study lamps. Meet Hetal from Gujarat and…

…the whole Earth too warm. Old, smoky power dirties the air; clean energy does not. Why is clean energy better? Clean energy — from the Sun, wind and water — makes power with no smoke. It…

…of Basic 1. This chapter helps you remember what you learnt in Green Energy — Basic 1, and adds a little more. In this chapter Fossil fuels — coal, oil and gas — and why they are a problem.…

…power? The Sun pours out light every day. Special flat boards called solar panels catch that sunlight and turn it into electricity. They make no smoke and no noise — just clean power from…

Green energy Clean power that makes no smoke, from the Sun, wind and water. Electricity The power that runs lights, fans and phones; it travels through wires. Solar panel A flat board that…

…A. Fill in the blanks (6 marks) Coal, oil and gas are called fuels. Solar cells are made mainly from , which comes from sand. In a generator, spinning near copper coils make electricity.…

…of Basic 1. This chapter helps you remember what you learnt in Green Energy — Basic 1, and adds a little more. In this chapter Remember: what energy is and why we need it every day. Power…

…it when power is needed, are being built in many states to store solar energy. Pranav and his grandfather look over the Tehri reservoir. Story Time — Pranav and the Two Lakes Pranav, age 13…

…transition for India’s coal districts. Careers and startups in clean energy. Meet Sumit from Chhattisgarh and Alisha from Maharashtra. The Big Idea Technology choices are also money and…

…Recap of Advance 1. This chapter revisits the science from Green Energy — Advance 1 and sharpens it with the numbers engineers actually use. In this chapter Recap: storage, the grid and why…

Now it is your turn! Tilt a solar panel towards the Sun, spin a turbine to light up homes, and fill a battery by day to use at night. Tap and slide to see clean energy at work. 1. Point the…

…· Total: 70 marks A. Fill in the blanks (8 × 1 = 8 marks) Annual energy = capacity × 8,760 × factor. The maximum efficiency of a single-junction solar cell is about %. Grid frequency in…

…A generator makes electricity by moving a near a coil of wire. Energy (kWh) = Power (kW) × (hours). The boundary between n-type and p-type silicon is called the p–n . Wind power depends on…

In this chapter Why transport is India’s biggest oil problem. Energy per kilometre: why electric drive wins on physics. Two- and three-wheelers, buses, trains, trucks, ships and planes.…

…and tritium, both forms of hydrogen — into helium, releasing energy. It is what powers the Sun. On Earth we must heat a plasma to over 100 million °C and hold it long enough and densely…

A. Fill in the blanks Solar panels catch _______. The wind spins a _______. Clean energy makes no _______. We should switch _______ what we do not use. B. Yes or No The Sun, wind and water…

…made from water and clean electricity. Geothermal, tidal and wave energy — a deeper look. Meet Riya from Maharashtra and Irfan from Ladakh. The Big Idea Plants capture the Sun’s energy as…

…and switch off what you are not using. Tap and slide to see clean energy at work. 1. Catch the Sunshine A solar panel makes electricity from sunlight. Slide the Sun higher for brighter…

…comes out of the rock, not the flame. Even a kiln fired entirely by solar heat would still release it.” Vikram was startled: roughly 60% of a cement plant’s CO₂ comes from this chemical…

…electricity rushing along the wires, all the way from a sunny solar farm into his spinning fan. “So the fan is really powered by the Sun?” “Today it may well be,” his grandfather said.…

…kites, and he was very good at it. On a breezy afternoon, his kite soared high while, far behind it, a big wind turbine turned on the edge of the city. His friend asked, “Why do you always…

…Life may not need a planet like ours at all — only liquid water, energy, and time. Story Time — The Most Important Question Sara · Goa Sara, who had always loved questions, asked her…