§4 Efficiency

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NatuurkundeMiddelbare schoolvwoLeerjaar 3

This lesson contains 15 slides, with interactive quizzes and text slides.

Items in this lesson

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Today's lesson

Whats efficiency
Calculations with efficiency, combined with energy.
Homework

Slide 2 - Slide

The energy flow diagram of an incandescent lamp.

The efficiency indicates the percentage of useful energy.

light

warmth

Electric energy

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It uses five times less energy, but still produces the same amount of light. The efficiency is five times higher than that of the incandescent lamp.

electric energy

light

energy-saving bulb

Incandescent lamp

warmth

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Calculating efficiency

For sums with energy use the formula with E and with power use P.

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of natural gas delivers

of energy

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Excercise

An electric bottle warmer has an output of 80 W. It takes 8.5 min for the temperature of the 200 g water in the baby bottle to rise from 7 °C to 37 °C.

a Calculate the efficiency of the bottle warmer.

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Answers excercise

Slide 11 - Open question

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Is there any extra explanation needed next week about this subject?

Yes

Only extra practice

Another subject

Slide 14 - Poll

§4 excercises 1 t/m 5

Slide 15 - Slide

§4 Efficiency

Items in this lesson

Slide 1 - Slide

Slide 2 - Slide

Slide 3 - Slide

Slide 4 - Slide

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Slide 10 - Slide

Slide 11 - Open question

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Slide 14 - Poll

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