Renewable Energy quiz

More questions about Renewable Energy

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   Which country heats 9 in 10 homes with underground hot water?

   Answer: Iceland

   Why: Reykjavík even pipes leftover geothermal water under busy streets and sidewalks to keep them clear of snow.

2. 2 Medium

   Which device turns solar panels' DC power into the AC homes use?

   Answer: Inverter

   Why: The rectifier does the reverse job, turning AC into DC inside things like laptop and phone chargers.

3. 3 Hard

   What do many solar tower plants store heat in for use after dark?

   Answer: Molten salt

   Why: The salt, a mix of sodium and potassium nitrate, is heated to about 565 °C and kept in insulated tanks.

4. 4 Easy

   Which part of a hydro plant actually makes the electricity?

   Answer: Generator

   Why: Water only spins the turbine; its shaft then turns magnets past copper coils in the generator to make electricity.

5. 5 Medium

   How long must sunlight hit Earth to match a year of human energy use?

   Answer: 1 to 2 hours

   Why: Earth's air, oceans and land soak up about 3.85 million exajoules of sunlight a year, thousands of times what we use.

6. 6 Hard

   Who discovered the photovoltaic effect in 1839?

   Answer: Edmond Becquerel

   Why: Becquerel discovered the effect at age 19 by observing electric currents from illuminated electrodes in an electrolyte.