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What is the main advantage of using hydroelectric power?

1. No greenhouse gas emissions
2. Dependence on weather
3. High initial cost
4. Limited availability

Which of the following is a disadvantage of wind power?

1. Low cost
2. High efficiency
3. Intermittent supply
4. Low maintenance

What is an example of a renewable energy resource?

1. Coal
2. Nuclear power
3. Natural gas
4. Solar power

Answers

- two insulating* objects, eg. large clouds with ice crystals

- rubbing movement

- electrons jumping from one object to the other

- charge = energy carried by an electron

* insulators are needed to make sure the electrons stay on the objects and don't escape

What is needed for static electricity?