Renewable energy (1) Wind power and solar power

Two renewable resources that will never run out!

Doc Brown's Physics Revision Notes

Suitable for GCSE/IGCSE Physics/Science courses or their equivalent


Wind Power - turbines and generators - advantages/disadvantages


Solar Power - solar panels - solar cells - advantages/disadvantages

Wind power - wind turbines generating electricity

 The technology of wind power

Wind turbine blades are driven by the kinetic energy of wind movement which in turn drive a generator (electrical energy).

Each set of turbine blades is connected to a generator to produce electricity which can be fed into a domestic supply or, more likely, fed into the National Grid system.

They are sited in clusters ('wind farms') in exposed locations on open land or out at sea (the latter is a more expensive location to erect the turbines). Locations are chosen after a survey is done to see if a commercial amount of wind blows!

Redcar Vertical Pier

Advantages of wind power

Wind turbine technology isn't cheap at the moment, BUT, as more are built and designs improve, they are becoming more commercially more viable and the energy is free and maintenance costs are low.

Free source of energy, however unreliable, this kinetic energy store resource will never run out.

There is no pollution, though some people feel they spoil the view of the landscape.

Costly to build, but relatively cheap to maintain in good running order.

Disadvantages of wind power

The initial capital costs are high, BUT the running costs are low.

It takes a great many wind turbines to generate the same amount of electricity as a large scale power station such as those run on nuclear of fossil fuels.

Wind power generation is not capable of dealing with the high energy demands of peak times eg peak travel times. and cooking because unfortunately you cannot increase power production at all.

Some people object to what they see as 'visual pollution' or 'noise pollution' but at one time hundreds of windmills were a common sight in the countryside.

There are several other problems too eg wind speed is variable and if it drops to zero, so does the power generation.

Wind turbines cannot, at the moment, cope with high electricity demands e.g. peak times in the day.


Solar power

The technology of solar power

Know and understand that 'renewable' electricity can be produced directly from the Sunís radiation.

You should know that solar cells can be used to generate electricity and should be able to describe the advantages and disadvantages of their use.

Solar cells (photovoltaic cells) produce 'small scale' electricity direct from sunlight energy.

Solar cells are fabricated from materials that respond light energy and promote the flow of electrons i.e. they created a potential difference causing an electrical current to flow.

Advantages and disadvantages of solar power

The Sun is a free energy store and non-polluting and never runs out.

The initial manufacture and installation costs of fitting solar panels are high, but they are getting cheaper and the running costs are very low.

Although non-polluting in itself, energy is used in making the solar panels.

The technology eg installation is expensive, but getting cheaper and it is non-polluting when installed and runs off free energy with very low maintenance costs.

On average, for half the day, there is no sunlight and the sunlight itself is of variable intensity e.g. cloudy to bright sun and of course it cannot work at night - so variable output is a problem, but it is being widely exploited in very sunny countries from eg Spain to African states.

Solar power is no good for a large scale electricity supply.

One important advantage is that it easy to install on a small scale in remote areas not connected to the mains electricity supply.

Lately, many people in developed countries are putting solar panels on their house roofs to generate electricity which adds to the electricity supply (National Grid) and reduces their own electricity bill. So, in developing countries, it is a most important and convenient way of generating electricity on a local small scale in locations far from a national electricity supply.

Solar panels cannot be used to produce electricity on the same scale as large nuclear or fossil fuelled power station.

  • Check out your practical work you did or teacher demonstrations you observed, all of this is part of good revision for your module examination context questions and helps with 'how science works'.

    • investigating the effect of changing different variables on the output of solar cells, eg distance from the light source, the use of different coloured filters and the area of the solar cells,

    • planning and carrying out an investigation into the effect of changing different variables on the output of model wind turbines, eg the number or pitch of the blades, the wind velocity,


Energy resources, and transfers, work done and electrical power supply revision notes index

Types of energy store - a comparison with examples explained, mechanical work done and power calculations

Conservation of energy, energy transfers, efficiency - calculations and Sankey diagrams gcse physics notes

Energy resources & uses, general survey & trends, comparing sources of renewables, non-renewables & biofuels

Renewable energy (1) Wind power and solar power, advantages and disadvantages gcse physics revision notes

Renewable energy (2) Hydroelectric power and geothermal power, advantages and disadvantages physics notes

Renewable energy (3) Wave power and tidal barrage power, advantages and disadvantages gcse physics notes

Comparison of methods of generating electricity, 'National Grid' power supply, mention of small scale supplies

Greenhouse effect, global warming, climate change, carbon footprint from fossil fuel burning gcse physics notes

See also The Usefulness of Electricity gcse physics electricity revision notes

IGCSE physics revision notes on wind power solar power KS4  physics Science notes on wind power solar power GCSE  physics guide notes on wind power solar power for schools colleges academies science physics course tutors images pictures diagrams for wind power solar power science physics revision notes on wind power solar power for revising  physics modules physics topics notes to help on understanding of wind power solar power university courses in technical science careers in physics jobs in the industry technical laboratory assistant apprenticeships technical internships in engineering physics USA US grade 8 grade 9 grade10 physics AQA  physics science GCSE notes on wind power solar power Edexcel GCSE physics science notes on wind power solar power for OCR 21st century  physics science OCR GCSE Gateway  physics science notes on wind power solar power WJEC gcse science CCEA/CEA gcse science O level physics notes on wind power solar power


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