Sources and Uses of Energy：練習問題

According to the Primary Science curriculum guide, which of the following is a renewable source of energy that can be used to generate electricity?

A student uses a hand-cranked flashlight. As the student turns the handle, the flashlight lights up. Which of the following best describes the primary sequence of energy conversion taking place?

A scientist classifies energy sources into two groups: those that are renewable and those that ultimately derive their energy from the Sun. Which of the following groups contains sources that ALL fit into both categories?

A ceiling fan is switched on and starts rotating. Which primary energy conversion takes place in the fan?

Which of the following actions is the most effective way to help save energy at home?

A student uses a solar panel to power a small electric fan. What is the main energy conversion that takes place in this setup to make the fan blades rotate?

Name two common non-renewable energy sources. Explain one significant reason why it is important to conserve these types of energy.

Describe the main energy transformations that occur when you pull back a toy car with a spring and then release it, causing it to move forward.

Energy can be obtained from various sources in nature.

(a) Identify whether the following are renewable or non-renewable energy sources: (i) Solar energy, (ii) Coal, (iii) Wind. (2 points)

(b) Briefly explain why it is important to conserve non-renewable energy sources like fossil fuels. (1 point)

Energy sources are categorized into renewable and non-renewable resources.

(a) Classify the following four energy sources into Renewable or Non-renewable:

(i) Natural gas
(ii) Wind
(iii) Crude oil (Petroleum)
(iv) Flowing water (Hydro)

(b) Explain the primary difference between renewable and non-renewable energy sources in terms of their availability and replenishment.