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To be able to describe static electricity and lightning as sources of energy

Module by: Siyavula Uploaders. E-mail the author

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NATURAL SCIENCES

Planet earth and the universe

Sources of energy and energy systems

EDUCATOR SECTION

Memorandum

Static:

  • Shop trolleys have little chains that trail on the ground. Charges flow into the ground.
  • Happens when something is rubbed and there is resistance, e.g. hands on a handle, clothes on a seat, etc.

Lightning:

Any examples, e.g.

  • Don’t stand in front of open doors and windows.
  • Wear shoes with rubber soles.
  • Stay away from wire fences.
  • Lie flat. Never stand upright or on an object.
  • Install lightning conductors.

Don’t use the telephone when there is lightning.

LEANER SECTION

Content

  • The natural sources of energy that we have examined, namely sun, wind and water, only partially meet the need for energy. Little attention has been paid to the development of these sources because it is difficult to capture, store and control these sources. The following are the main resources used to supply the human need for energy.

Figure 1
Figure 1 (graphics1.png)

Nuclear power is the newest and most dangerous fuel that is available.

We will now examine the sources of electrical energy, the following in particular:

static electricity and lightning

cells

batteries

dynamos

coal-driven power stations

nuclear power

You have already become acquainted with some of these sources in Grade 5. This year we are going to deal with them in more detail. We are also going to help you to understand what energy systems are and how some of the sources can be described as systems.

Meanwhile, remember the following definition of a system:

A system consists of two or more parts that work together or influence one another.

ACTIVITY: To be able to describe static electricity and lightning as sources of energy [LO 2.3]

  • STATIC ELECTRICITY

We have learnt that static electricity is present in the air around us at all times. Static electricity is not very powerful, but we can make it more powerful by means of friction.

Figure 2
Figure 2 (graphics2.png)

Static electricity can also cause an unpleasant electrical shock. Metal shopping trolleys used in shops are made in a way that allows the electricity that builds up to be conducted away.

Figure 3
Figure 3 (graphics3.png)
  • Discuss this method of conduction in your group and draw a picture of shopping trolley.

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  • How does static electricity originate?

_____________________________________________________________________

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  • LIGHTNING

You have learnt that all materials are composed of small particles. Such particles are sometimes charged with electricity. They can be positively or negatively charged. Electricity is generated when negatively charged particles move from one place to another. Sometimes the flow of electricity is observed as a spark. Lightning is a great deal of electricity that is observed as a spark in the air. One could say that lightning results from large numbers of negatively charged particles moving from one cloud to another.

  • Write down some safety measures that can be applied during a thunderstorm.

1.___________________________________________________________________

2. ___________________________________________________________________

3. ___________________________________________________________________

4. ___________________________________________________________________

Assessment

Learning Outcome 2:The learner will know and be able to interpret and apply scientific, technological and environmental knowledge.

Assessment Standard 2.3: We know this when the learner interprets information

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What are tags? tag icon

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