Context and question: In 2007, however, a large current account deficit and rising inflation put pressure on Estonia's currency, which was pegged to the Euro, highlighting the need for growth in export-generating industries. Estonia exports mainly machinery and equipment, wood and paper, textiles, food products, furniture, and metals and chemical products. Estonia also exports 1.562 billion kilowatt hours of electricity annually. At the same time Estonia imports machinery and equipment, chemical products, textiles, food products and transportation equipment. Estonia imports 200 million kilowatt hours of electricity annually.
How much electricity is imported by Estonia annually?
Answer: 200 million kilowatt hours
Context and question: The five most prevalent chains are Lotte, Hyundai, Shinsegae, Galleria, AK plaza. Lotte Department Store is the largest, operating more than 40 stores (include outlet, young plaza, foreign branches). Hyundai Department Store has about 14 stores (13dept, 1outlet), and there are 10 stores in Shinsegae. Shinsegae has 3 outlet store with Simon. Galleria has 5, AK has 5 stores. Galleriaeast and west is well known by luxury goods. These five department stores are known to people as representative corporations in the field of distirution in South Korea. From fashion items to electric appliances, people can buy various kinds of products. Every weekend, people are fond of going around these department stores, because their location is usually easy to visit. As of 2010 the Shinsegae department store in Centum City, Busan, is the largest department store in the world.
What store was the smallest department store in the world in 2010?
Answer: unanswerable
Context and question: The current–voltage characteristic of an LED is similar to other diodes, in that the current is dependent exponentially on the voltage (see Shockley diode equation). This means that a small change in voltage can cause a large change in current. If the applied voltage exceeds the LED's forward voltage drop by a small amount, the current rating may be exceeded by a large amount, potentially damaging or destroying the LED. The typical solution is to use constant-current power supplies to keep the current below the LED's maximum current rating. Since most common power sources (batteries, mains) are constant-voltage sources, most LED fixtures must include a power converter, at least a current-limiting resistor. However, the high resistance of three-volt coin cells combined with the high differential resistance of nitride-based LEDs makes it possible to power such an LED from such a coin cell without an external resistor.
How are LEDs similar to other diodes?
Answer:
the current is dependent exponentially on the voltage