#Physics 101 pretest electricity how to#

You would get 2 marks for a correct answer with no working shown. To answer this question, you need to make a basic calculation: The average output of a wind turbine is 0.5 MW.Ī group of factories requires 50 MW to operate.Ĭalculate the number of wind turbines needed to meet the needs of the group of factories. īe careful – it is very easy to give one reason and then move onto the next question. The amount of energy supplied by the solar panels per hour will be much lower than the amount supplied by the coal power station. Solar panels will not provide a consistent supply of energy as the coal power station does. You must give two reasons to earn maximum marks. Give two reasons why this might not be good idea. the material used in nuclear power plants (usually uranium), is non-renewable.Ī student suggests replacing a coal power station with solar panels on the same site. The correct answer is ‘Geothermal, the tides and hydro-electricity’. Read each statement carefully before ticking a box.

Geothermal, the tides and hydro-electricity.

The tides, water waves and nuclear fuel.

Which of the following groups are all renewable energy sources? The correct answer is ‘There are no hills to restrict the flow of air.’ For example, in this question, it is unlikely that turbines off shore are easier to maintain than those on land. If you don’t know the correct answer immediately, try to rule out other options. If you tick more than the specified number, you will get no marks. With multiple-choice questions like this, be careful to tick the correct number of boxes – in this case, just one.

There are no hills to restrict air flow.

Turbines are easier to maintain off shore.

The wind speed is constant over the sea.

What is one of the reasons for building wind turbines a few miles out to sea? Let’s have a look at some typical ‘Energy’ questions.

Elastic potential energy = 0.5 ´ spring constant ´ (extension) 2.

Thermal Energy for a change in state = mass ´ specific latent heat.

Change in thermal energy = mass ´ specific heat capacity ´ temperature change.

Only the following equations will be given to you in the exam:

OCR GCSE Twenty-First Century Physics B (pages 17–20).

OCR GCSE Gateway Science Physics A (pages 53–54).

The equations that you need to learn are given in the GCSE Physics specification:

You will be required to recall most of the equations needed to carry out the calculations for this topic, and rearrange them as necessary.

#Physics 101 pretest electricity how to#

how to carry out calculations regarding energy stores and transfers.the effects on the environment of using some of these sources.how energy can be stored and transferred.When answering questions on this topic, you will need to know: Energy transfer is needed in order to make things work.