1. The energy transfer diagram represents the energy of a light bulb. How much e
ID: 1783738 • Letter: 1
Question
1. The energy transfer diagram represents the energy of a light bulb.
How much electrical energy is involved in this transformation?
60 J
80 J
100 J
120 J
2.
The ray diagram shows a vase that is placed beyond the center of curvature of a concave mirror.
Which best describes how the image of the vase will appear?
It will be larger than the vase and upright.
It will be smaller than the vase and upright.
It will be larger than the vase and inverted.
It will be smaller than the vase and inverted.
3
A wind turbine takes in energy from wind with the goal of converting it into electrical energy. Much of the wind energy is also converted into the kinetic energy of the spinning turbine and heat lost to the air around it.
If the goal of the turbine is to put out electric energy, what is the efficiency of the turbine?
25%
50%
75%
100%
Explanation / Answer
(1) The electrical energy of the bulb is 120J.
(2) The image will be smaller than the vase and inverted.
(3) The efficiency will be 25%.
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