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Generation of ElectricityGeneration of Electricity

Learning OutcomesLearning Outcomes

• Use data to estimate the power output of power stations and micro generatorse.g. from energy content of fuel and conversion efficiency.

• Experimentally determine the density of materials, including air and water.

• Use data to estimate the power output of power stations and micro generatorse.g. from energy content of fuel and conversion efficiency.

• Experimentally determine the density of materials, including air and water.

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Efficiency

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Example 1: Jimmy is supposed to spend 5 hours a week doing homework. Because he has a poor attention span, he spends 2hrs during which he should be working, picking his nose and daydreaming.

How efficient is Jimmy at doing his homework? [2]

Example 1: Jimmy is supposed to spend 5 hours a week doing homework. Because he has a poor attention span, he spends 2hrs during which he should be working, picking his nose and daydreaming.

How efficient is Jimmy at doing his homework? [2]

%

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Example 2: Sarah is 80% efficient when it comes to doing her homework. If she is supposed to spend 8hrs a week on homework, how much of that time does she spend actually working (rather than thinking about shoes and boys).

[3]

Example 2: Sarah is 80% efficient when it comes to doing her homework. If she is supposed to spend 8hrs a week on homework, how much of that time does she spend actually working (rather than thinking about shoes and boys).

[3]

%

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Example 3: A nuclear PowerStation is 32% efficient at converting nuclear energy stored in the uranium, into electrical energy. If each gram of uranium contains 50kj of nuclear energy. How much energy will be produced by a power station, if it uses up 1kg of fuel?

[4]

Example 3: A nuclear PowerStation is 32% efficient at converting nuclear energy stored in the uranium, into electrical energy. If each gram of uranium contains 50kj of nuclear energy. How much energy will be produced by a power station, if it uses up 1kg of fuel?

[4]

kJ

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Density

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Generation of Electricity

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Example 1: After placing an odd shaped object in a measuring cylinder to measure its volume, Sheldon works out its mass, using a mass balance. He finds out that it has a volume of 0.1m3 and a mass of 4kg. What is its density?

[2]

Example 1: After placing an odd shaped object in a measuring cylinder to measure its volume, Sheldon works out its mass, using a mass balance. He finds out that it has a volume of 0.1m3 and a mass of 4kg. What is its density?

[2]

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Example 2: Leonard is told that wood has a density of 0.5kg m-3. He submerges a piece of it in water and sees that it has a volume of 22 m3 What is the mass of the piece?

[3]

Example 2: Leonard is told that wood has a density of 0.5kg m-3. He submerges a piece of it in water and sees that it has a volume of 22 m3 What is the mass of the piece?

[3]

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Make a 30/60 second news bulletin about the lesson/learning.

Some people will be chosen to share, and maybe even recorded!

Make a 30/60 second news bulletin about the lesson/learning.

Some people will be chosen to share, and maybe even recorded!