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第31至35 題為題組
Since the early 1990s, the hihilin zion battery has been the most suitable battery for portation to y
31
electronic equipment. Today, they're commonly used for cellphones, computers, tablets, digital
cameras, and other devices.
Lithium-ion batteries have nearly twice the energy density of traditional nicket cadmium
batteries. 31 This feature has important
implications for cellphones and computers, because it
makes these items more portable for consumers. It also makes power tools easier to use and allows
workers to use them for longer periods of time,
32.
32 Lithium-ion batteries retain
retain mo naman of their power capacity from previous
charging cycles. Thus they require no scheduled cycling and can be fully re-fueled to their maximum
capacity during each charging cycle. Other rechargeable battery types, in contrast, retain information
from previous charging cycles, which wastes valuable storage space. Over time, this makes these
rechargeable batteries hold less of a charge.
33 It is fragile and requires a protection circuit to maintain safe operation. A high load
could overheat the pack and safety might be jeopardized. 34 F After 2-3 years of use, the pack
often becomes unserviceable due to a large voltage drop caused by high internal resistance.
It should be noted, however, that manufacturers are constantly making improvements on
lithium-ion batteries.
35 With such rapid progress, the use of lithium-ion batteries will
certainly expand further.
(A
(A) The lithium-ion battery is also a low maintenance battery.
(B) Despite its overall advantages, the lithium-ion battery has its drawbacks.
(C) New and enhanced chemical combinations are introduced every six months or so.
(D) Attempts to develop rechargeable lithium-ion batteries failed due to memory problems.
(E) That is, they carry more power in a smaller unit, helping to reduce overall weight and size.
d
(F). Another downside is the increase of the internal resistance that occurs with cycling and aging.
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