GCSE AQA Physics Energy Transfers: Electricity is generated when wa

Electricity is generated when water from the reservoir flows through the turbines - AQA - GCSE Physics - Question 10 - 2020 - Paper 1

Question 10

Electricity is generated when water from the reservoir flows through the turbines. Write down the equation which links density (ρ), mass (m) and volume (V). 1 mar... show full transcript

Worked Solution & Example Answer:Electricity is generated when water from the reservoir flows through the turbines - AQA - GCSE Physics - Question 10 - 2020 - Paper 1

Step 1

Write down the equation which links density (ρ), mass (m) and volume (V).

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Answer

The equation that links density, mass, and volume is:

ho = \frac{m}{V}

Step 2

Calculate the mass of water in the reservoir. Give your answer in standard form.

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Answer

To calculate the mass of water in the reservoir, use the equation:

m = \rho \times V

Substituting the provided values:

m = 998 \, \text{kg/m}^3 \times 6,500,000 \, \text{m}^3

Calculating:

m = 6,487,000,000 \, \text{kg}

In standard form, this is:

m = 6.487 \times 10^9 \, \text{kg}

Step 3

Write down the equation which links energy transferred (E), power (P) and time (t).

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Answer

The equation that links energy transferred, power, and time is:

E = P \times t

Step 4

Calculate the maximum energy that can be transferred by the electrical generators.

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Answer

Given:

Power, $P = 1.5 \times 10^6 \text{ W}$
Time, $t = 5 \, ext{hours} = 5 \times 60 \times 60 = 18,000 \, ext{s}$

Calculating the maximum energy:

E = P \times t = 1.5 \times 10^6 \times 18,000 = 2.7 \times 10^{10} \text{ J}

Step 5

Give two reasons why this hydroelectric power station is not able to meet the increase in demand shown between 04:00 and 16:00 in Figure 15.

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Answer

The variation in demand is much greater than the power output of the hydroelectric power station.
The demand remains high for longer than 5 hours.

Electricity is generated when water from the reservoir flows through the turbines - AQA - GCSE Physics - Question 10 - 2020 - Paper 1

Worked Solution & Example Answer:Electricity is generated when water from the reservoir flows through the turbines - AQA - GCSE Physics - Question 10 - 2020 - Paper 1

Write down the equation which links density (ρ), mass (m) and volume (V).

Calculate the mass of water in the reservoir. Give your answer in standard form.

Write down the equation which links energy transferred (E), power (P) and time (t).

Calculate the maximum energy that can be transferred by the electrical generators.

Give two reasons why this hydroelectric power station is not able to meet the increase in demand shown between 04:00 and 16:00 in Figure 15.

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