Where does electricity come from and how did early scientists make it?
What will be an ideal response?
Where we live, it comes from the wall, but that was not always the case nor is it the case in much of the world even now. When the early scientists began to use electricity, they had to make their own. They did that using fuel cells. If you look fuel cells up in the Dictionary of Scientific and Technical terms, you will find: “a cell that converts chemical energy directly into electrical energy, with electric power being produced as a part of a chemical reaction between the electrolyte and a fuel. ...”
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Answer the following statement(s) true (T) or false (F)
1. A flow switch either closes or opens a set of gates. 2. Typical applications of flow switches are commonly found in the chemical and petroleum industries. 3. The insulation of the wire leading to the switches must be adequate to withstand the high pressure of the liquid inside the pipe. 4. You can consult the NEC® for insulation temperature ratings. 5. Air condition and heating circuits often use timed contacts that are self-contained and do not require a coil for operation. Their time delay is preset and cannot be adjusted.
_____________________ refers to the electrical conductivity of the materials used in solid-state components.
Fill in the blank(s) with the appropriate word(s).
If a plant flowers in the fall, divide and replant in the fall
Indicate whether the statement is true or false
The radius of a twelve-cut pizza is 7.5 inches and the radius of an eight-cut pizza is 5.25 inches. Compare the areas of the two pizzas. Round the answer to 2 decimal places.
Fill in the blank(s) with the appropriate word(s).