Physics 9 Chapter 6 - Work and Energy - 21


1. When sunlight falls on a solar cell, into which energy light energy is converted?




2. Which of the following converts light energy into electrical energy?




3. Solar cells are used to power..............?




4. In the United States, some wind farms generate more than .....................of electricity a day?




5. Which energy is used by windmills to grind grain?




6. Which energy is used by windmills to pump water?




7. Which energy is used to turn wind turbines?




8. Where wind farms generate more than 1300 MW of electricity a day?




9. Water reaching close to the magma changes to steam due to the high temperature of magma. What is energy thus produced called?




10. What is the hot molten part, deep in the Earth called?




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