Can you finish the questions you started last lesson?

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Presentation transcript:

Can you finish the questions you started last lesson? Do now! Can you finish the questions you started last lesson?

Energy transfer (change) A lamp turns electrical energy into heat and light energy

Sankey Diagram A Sankey diagram helps to show how much light and heat energy is produced

Sankey Diagram The thickness of each arrow is drawn to scale to show the amount of energy

Sankey Diagram Notice that the total amount of energy before is equal to the total amount of energy after (conservation of energy)

Efficiency Although the total energy out is the same, not all of it is useful.

Efficiency Efficiency is defined as Efficiency (%) = useful energy output x 100 total energy input

Example Efficiency = 75 x 100 = 15% 500

Energy efficient light bulb Efficiency = 75 x 100 = 75% 100 That’s much better!

More complex examples

You then did some questions!

Thermal energy transfer

Thermal Energy Transfer

Heat can travel by Convection

Heat can travel by Convection A hot fluid expands, so is less dense, so rises. Cold fluid takes its place. A convection current can be formed.

Examples of Convection

Heat cannot travel in solids by convection. Why?

Draw the sentence A fluid is a liquid or gas When a fluid is heated it expands This makes it less dense than the surrounding fluid The heated fluid rises because it is less dense Cooler fluid takes its place In this way a circular convection current can be formed Convection currents can occur in kettles Convection currents also cause wind.