Scientific research should be carried out and controlled by the government rather than private companies. To what extent do you agree or disagree? Give reasons for your answer and include any relevant examples from your own knowledge or experience. Write at least 250 words. Task 2 同意与否题 政...
By the later 1700s, the scientific community was beginning to get a clearer picture of how electricity worked.Benjamin Franklinran his famous kite experiment in 1752, proving that lightning was electrical in nature. He also presented the idea that electricity had positive and negative elements and ...
Every electrical device or load has resistance. Resistance is like a restriction to the flow of electrons and electricity is dissipated as heat energy in a resistance. For a fixed voltage applied to a load, the higher the resistance, the lower the current. Going back to the water analogy, ...
The electricity magnetizes the electromagnet. Increasing current boosts the electromagnet's magnetic force, and decreasing current lowers the magnetism. When the current jumps to unsafe levels, the electromagnet is strong enough to pull down a metal lever connected to the switch linkage. The entire ...
While the processes by which they produce electricity differ slightly from battery to battery, the basic idea remains the same. When a load completes the circuit between the two terminals, the battery produces electricity through a series of electrochemical reactions between the anode, cathode and ...
Animation: What's the difference between DC and AC electricity? Suppose you have to vacuum a room. Direct current is a bit like working from one side to the other in a straight line; alternating current is like going back and forth on the spot. Both get the job done, albeit in ...
The magnetic fields generated by the interaction of these coils then turn a thin aluminum disc at a controlled speed proportional to the amount of electricity consumed. The spinning of the disc moves the dials that indicate the total electricity consumed in kilowatt-hours. A utility worker...
ft. This 1:2 ratio is the sweet spot, giving a full load of wet laundry enough room to dry efficiently without wasting energy. One caution: don't get distracted with sales terminology. Words like "extra-large," "king-size," and "ultra-capacity" are not fixed, standardized definitions, ...
Where to Get Seeds or Clones –Make sure to choose the right strain Electricity Use (For Indoor Growers) Setup Cost Setup & Supplies Pick Your Grow Space Choose Growing Medium Choose Grow Lights Choose Nutrients (if needed) Supplies Checklist –Are You Ready to Start Growing? Start Growing Can...
英语翻译The production of electricity,internal combustion engines,and industrial activities are the controlled use of fire.However,uncontrolled fires lead to thousands of fatalities every year.Understanding fire,how it can prevented,and how to de