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A windfarm generates electrical power from the wind.. - Edexcel - GCSE Physics - Question 5 - 2012 - Paper 1

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A windfarm generates electrical power from the wind... (a) State one disadvantage of using the wind to generate electrical power. (b) A windfarm generates 322 MW o... show full transcript

Worked Solution & Example Answer:A windfarm generates electrical power from the wind.. - Edexcel - GCSE Physics - Question 5 - 2012 - Paper 1

Step 1

State one disadvantage of using the wind to generate electrical power.

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Answer

One disadvantage of using wind to generate electrical power is unreliability. The wind does not always blow consistently and may not generate power during calm conditions.

Step 2

Calculate the current from the windfarm.

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Answer

To calculate the current, we can use the formula:

I=PVI = \frac{P}{V}

Where:

  • PP is the power (322 MW or 322,000,000 W)
  • VV is the voltage (132 kV or 132,000 V)

Substituting the values:

I=322,000,000132,000≈2434.85 AI = \frac{322,000,000}{132,000} \approx 2434.85 \text{ A}

Therefore, the current from the windfarm is approximately 2434.85 A.

Step 3

Calculate the power produced by each improved turbine.

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Answer

First, calculate the additional power generated:

539 MW−322 MW=217 MW539 \text{ MW} - 322 \text{ MW} = 217 \text{ MW}

To find the power produced by each improved turbine, divide the additional power by the number of improved turbines:

217 MW75≈2.893 MW\frac{217 \text{ MW}}{75} \approx 2.893 \text{ MW}

Thus, each improved turbine produces approximately 2.893 MW.

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