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

To calculate the current, we use the formula:

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

where:

• $P$ is the power (322 MW or $322 \times 10^6$ W)
• $V$ is the voltage (132 kV or $132 \times 10^3$ V)

Thus, substituting the values:

$I = \frac{322 \times 10^6}{132 \times 10^3} = 2434.84 \text{ A}$

Therefore, the current from the windfarm is approximately 2440 A.

To find the power produced by each improved turbine, first calculate the additional power generated:

$539 - 322 = 217 \text{ MW}$

Now, divide the additional power by the number of new turbines (75):

$\frac{217 \text{ MW}}{75} \approx 2.89 \text{ MW}$

Thus, each improved turbine produces approximately 2.89 MW.