Laptops and hand held devices

Lithium batteries back up power stations

Batteries are critical to the development of portable (electrical) devices. And lithium-ion batteries have been up there in driving the portability revolution. Rechargeable lithium-ion batteries hold more charge in a lighter package (as lithium is the lightest metal – hydrogen is not a metal) and have dramatically improved the performance of phones to small electric aircraft. But they do have one drawback – they charge and discharge too rapidly (and the resultant heat can damage the battery or cause a fire). So they need constant monitoring and control by a built-in electronic circuit to avoid this problem.

Construction and operation

The basic More >

Figure 1

When was the battery invented?

One of the early attractions that gained public attention was an electrically illu­minated bridge over the river Seine during the 1900 World Fair in Paris.

The use of electricity may go back much further. While constructing a new railway in 1936 near Baghdad, workers uncovered what appeared to be a prehistoric battery. The discovery was known as the Parthian Battery and was believed to be 2000 years old, dating back to the Parthian period.

The battery consisted of a clay jar filled with a vinegar solution. An iron rod sur­rounded by a copper cylinder penetrated into the liquid and produced 1.1 to More >


iPad by Apple


Evidence was discovered that Apple was interested in the name “iSlate, prior to settling on “iPad”.

A search in the Canadian trademark database reveals that Apple’s dummy corporation Slate Computing, LLC applied for a trademark for “iPad” under the categories of handheld mobile digital electronic devices with a broad range of applications. This application was filed in July 2009 — much more recently than the original iSlate trademarks which date back to 2006-2007. Slate Computing, LLC did not apply for a similar trademark in the U.S. due to the fact that Fujitsu appears to control the U.S. trademark as it relates More >