The topic sentence introduces the reader to what you will talk about.
B. They announce the main ideas of paragraphs
There are three main components needed to make a complete circuit. First, a power source is need, such as a battery. Next, you will need something that will take in the power. This can be anything like a heating coil, or light bulb, etc. Then you need the wiring that will connect to the object and receive power.
This is a question you should answer on your own since the answer of this question should be from your perspective.
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