A customs duty or due is the indirect tax levied on the import or export of goods in international trade. In economic sense, a duty is also a kind of consumption tax.A duty levied on goods being imported is referred to as an import duty.Similarly, a duty levied on exports is called an export duty.A tariff, which is actually a list of commodities along with the leviable rate (amount) of customs duty, is popularly referred to as a customs duty. customs duty or due is the indirect tax levied on the import or export of goods in international trade. In economic sense, a duty is also a kind of consumption tax.
1 A variety of substances are used in lithium batteries, but a common combination is a lithium cobalt oxide cathode and a carbon anode. 2  Lead-acid battery (rechargeable) : This is the chemistry used in a typical car battery. Zinc-carbon battery: The zinc-carbon chemistry is common in many inexpensive AAA, AA, C and D dry cell batteries. 2  The anode is zinc, the cathode is manganese dioxide, and the electrolyte is ammonium chloride or zinc chloride. 3  Alkaline battery: This chemistry is also common in AA, C and D dry cell batteries.
How Does It Work. Batteries are comprised of two different metals suspended in an acidic solution. With the Fruit-Power Battery, the two metals are zinc and copper. The zinc is in the galvanization on the nails, and the pennies are actually copper-plated zinc. The acid comes from the citric acid inside each lemon. The two metal components are electrodes, the parts of a battery where electrical current enters and leaves the battery. With a zinc and copper setup, the electron flow is out of the penny (copper) and into the nail (zinc) through the acidic juice inside the lemon.