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Internal resistance depends on temperature; for example, a fresh Energizer E91 AA alkaline primary battery drops from about 0.9 Ω at -40 °C, when the low temperature reduces ion mobility, to about 0.15 Ω at room temperature and about 0.1 Ω at 40 °C. [1]
Electrostatic machines are typically used in science classrooms to safely demonstrate electrical forces and high voltage phenomena. The elevated potential differences achieved have been also used for a variety of practical applications, such as operating X-ray tubes, particle accelerators, spectroscopy, medical applications, sterilization of food, and nuclear physics experiments.
A variety of standard sizes of primary cells. From left: 4.5V multicell battery, D, C, AA, AAA, AAAA, A23, 9V multicell battery, (top) LR44, (bottom) CR2032 A primary battery or primary cell is a battery (a galvanic cell) that is designed to be used once and discarded, and it is not rechargeable unlike a secondary cell (rechargeable battery).
The Energizer logo used by Pep Boys is similar to the 1980s-era logo first used with the consumer dry cell batteries. Both Eveready and Energizer are marketed as different brands in some markets in Asia. This has led to the availability of both "Eveready Gold" Alkaline batteries and Energizer Alkaline batteries on store shelves.
Button, coin, or watch cells. A button cell, watch battery, or coin battery is a small battery made of a single electrochemical cell and shaped as a squat cylinder typically 5 to 25 mm (0.197 to 0.984 in) in diameter and 1 to 6 mm (0.039 to 0.236 in) high – resembling a button.
The increasing integration of computers into the classroom and the phenomenal growth of the Internet has brought about the need to combine the new educational technologies with teaching practices and techniques. Virtual realia are digitized objects and items which are now brought into the classroom as examples or aids. They are often used to ...
Interdisciplinary teaching is a method, or set of methods, used to teach across curricular disciplines or "the bringing together of separate disciplines around common themes, issues, or problems.” [1] Often interdisciplinary instruction is associated with or a component of several other instructional approaches.
Students in jigsaw classrooms ("jigsaws") showed a decrease in prejudice and stereotyping, liked in-group and out-group members more, showed higher levels of self-esteem, performed better on standardized exams, liked school more, reduced absenteeism, and mixed with students of other races in areas other than the classroom compared to students in traditional classrooms ("trads").