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A regular incandescent bulb is 7% efficient. Which of the following statements best explains this statement?

A.
For every 100 units of electrical energy that enter a light bulb, 7 units are changed into light energy.

B. Every hour that a light bulb is on it uses 7 kW of electric energy.

C. 7 % of the electrical energy that reaches a light bulb is wasted as heat.

D. 7 % of the electrical energy that reaches a light bulb goes right through without being used.

Sagot :

Answer:

Fossil fuels store energy from the sun as

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