GGR333H5 Lecture Notes - Lecture 4: Carbon Cycle, Making Money

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6 May 2018

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WEEK 4: ENERGY AND CLIMATE CHANGE

RECAP

• Primary energy from coal largely replaced the old way of doing things

• Historically, agriculture has taken up the most energy

Forms of Energy

Kinetic and Potential Energy

• Scientific concept of energy about the nature of motion

• What is special about a moving object?

• What keeps it moving?

• Potential: expected capacity

• Kinetic: energy in motion/movement. Involves its mass (M) and speed (v):

(1/2)mv2

• Force (F): needed to accelerate an object

• Gravity (G): downward acceleration toward Earth

• Weight (W): downward gravitational force of an object

• i.e. Wind turbines transform the kinetic energy of the wind into electrical energy

• Air has an average mass of ~1.29kg/m3 and carries kinetic energy when it blows as

wind.

Storage

• Batteries i.e. a car battery

• Pumped Storage: using gravity and weight to power a turbine during peak hours

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