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Energy Transfers and Efficiency

Authored by Science Staff

Physics

8th - 10th Grade

10 Questions

Used 242+ times

Energy Transfers and Efficiency
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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An open system is...

an object with a hole in it

an object which gains or loses energy

an object which does not let energy in or out

an object that is outside

2.

FILL IN THE BLANK QUESTION

30 sec • 1 pt

Almost all objects lose energy in the form of __________.

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Select the correct equation:

Efficiency = usefulwasted×100Efficiency\ =\ \frac{useful}{wasted}\times100

Efficiency = wasteduseful×100Efficiency\ =\ \frac{wasted}{useful}\times100

Efficiency = wastedinput×100Efficiency\ =\ \frac{wasted}{input}\times100

Efficiency =usefulinput×100Efficiency\ =\frac{useful}{input}\times100

4.

FILL IN THE BLANK QUESTION

30 sec • 1 pt

A __________ diagram shows the energy transfers in a system.

5.

FILL IN THE BLANK QUESTION

30 sec • 1 pt

Media Image

What is the value of the wasted energy?

6.

FILL IN THE BLANK QUESTION

30 sec • 1 pt

Media Image

As a percentage, what is the efficiency of the bulb represented by the Sankey diagram?

7.

FILL IN THE BLANK QUESTION

30 sec • 1 pt

Media Image

What type of energy is useful?

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