Download A Kitchen Course in Electricity and Magnetism by David Nightingale, Christopher Spencer PDF

By David Nightingale, Christopher Spencer

Electricity is throughout us: autos, phones, desktops, lighting fixtures -- the trendy international runs totally on electrons. yet what are electrons? How do they behave? How will we keep an eye on them? This booklet will make it easier to construct a battery, become aware of static electrical energy and build a uncomplicated present meter, all utilizing universal goods out of your kitchen. alongside the best way you will know about the that means of "voltage" and "current", what makes an LED paintings and the variation among AC and DC. The final bankruptcy makes use of transistors -- the fundamental construction blocks of each laptop -- for plenty of attention-grabbing experiments. With lots of colourful illustrations, historic tales and a simple, obtainable variety, "A Kitchen path in electrical energy and Magnetism" might be an outstanding begin for budding and novice scientists who are looking to examine extra approximately how the realm works.

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Extra resources for A Kitchen Course in Electricity and Magnetism

Example text

What is happening is that the slightly acidic saliva on your tongue is adding electrons to each metal, but in different amounts, thus leaving one metal relatively more positive than the other. Now it was a “mechanical” loss or gain of electrons that happened in our friction experiments, but this time it is to do with the chemical reaction when acids attack metals, and this process is just what we want—if things are to be continuous. The two different metals may be called (+) and (À), with the one having the larger number of electrons being (À).

Remember that the charge is being shared with the electroscope, so we will need more charge. The electroscope slivers—or leaves— will gradually begin to show a small divergence. This small divergence is enough, because when we slide the inner cylinder up and out of the jar the leaves will diverge, as we see in Fig. 23. When we slide it back down, the leaves return to their much lesser divergence. We can do this many times, losing nothing—if it’s a dry day! 15 Experiment: Charging by Inducing Charges (May Be Omitted with No Loss of.

6 Sidebar Experiment: Electroplating Before continuing with other ways of obtaining voltages—for example using a potato—we note that Volta’s battery may, in principle, be run in reverse. Recall that we had two different metals in an acid, giving us electricity. 5 V cell. Without going into any chemistry we will find that, with some adjustments, we can cause the material of one metal to be transported across to the other (different) metal! This is called electroplating. We will not use aluminum this time, because aluminum does not work well here, but we will keep copper as the (+) electrode, and the (À) electrode may be for example a kitchen fork, a coin with a surface of some alloy such as nickel, or perhaps a tool from the workshop.

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