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

By David Nightingale, Christopher Spencer

Electricity is throughout us: automobiles, phones, pcs, lighting fixtures -- the trendy global runs totally on electrons. yet what are electrons? How do they behave? How will we regulate them? This ebook will provide help to construct a battery, observe static electrical energy and build a simple present meter, all utilizing universal goods out of your kitchen. alongside the way in which you will know about the which 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 elemental construction blocks of each laptop -- for many fascinating experiments. With lots of colourful illustrations, old tales and a straightforward, obtainable kind, "A Kitchen path in electrical energy and Magnetism" might be a good commence for budding and novice scientists who are looking to study extra approximately how the area works.

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Extra info for A Kitchen Course in Electricity and Magnetism

Sample text

1 What Was Happening As we saw, different metals in an acid, or what we called an electrolyte, gave us a voltage. The acid attacked the metals differently, causing one metal to gain more electrons than the other, and generally it is the copper that becomes more (+). 7 Experiment: Potato Battery Fig. 7 A single-potato battery giving us just under half a Volt Fig. 8 Each fruit yields about half a Volt. 47 V 37 38 2 Current and Voltage Fig. 9 Here we have inserted a dark background in an attempt to show the faint glow from the little red LED An electrochemist will tell us that it is to do with the relative atomic numbers of the elements.

15. Make sure that the coil is exactly to one side of the compass needle. If you have no bulb holder some wires can simply touch, as in the photos. , the wire is touched to the battery) the current flowing through the bulb will also be flowing through the coil—like water traveling through two or three hoses connected one after the other. It has to be the same current going through the coil, wire, or battery, because there were no turnoffs or alternative routes. The bulb will light up just as brightly as before, and you have noticed that the compass needle has deflected from its previous North–South line, as shown by Fig.

1 milli-Amp, commonly called mA, we would detect a very small current flow between aluminum and copper. On p. 43 we will make, for educational reasons rather than sensitivity, a crude current meter. Meanwhile, however, we could purchase an inexpensive multimeter (see p. 158) with a sensitive scale—typically of ~100 microAmps. ) The authors found, using such a meter, that the copper coin and sliver of aluminum (as in Fig. 2) gave a continuous short-circuit current (short circuit means the + and À are directly connected—here through the meter) of ~45 microAmps or 45/1000 000 of an Amp.

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