A capacitor is a device that stores electrical energy in an electric field. It is a passive electronic component with two terminals. The effect of a capacitor is known as capacitance. While some capacitance exists between any two electrical conductors in proximity in a circuit, a capacitor is a component designed to add capacitance to a circuit. The capacitor was originally known as a condenser or condensator. This name and its cognates are still widely used in many languages, but rarely in English. Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential. There are two closely related notions of capacitance: self capacitance and mutual capacitance. Any object that can be electrically charged exhibits self capacitance. In this case the electric potential difference is measured between the object and ground. A material with a large self capacitance holds more electric charge at a given potential difference than one with low capacitance. The notion of mutual capacitance is particularly important for understanding the operations of the capacitor, one of the three elementary linear electronic components (along with resistors and inductors). In a typical capacitor, two conductors are used to separate electric charge, with one conductor being positively charged and the other negatively charged, but the system having a total charge of zero. The ratio in this case is the magnitude of the electric charge on either conductor and the potential difference is that measured between the two conductors. |
If you want combined shipping, please purchase all your items in one order. If you purchase items in more than one order, send us a message so that we know about the additional items and box the orders together. (When items are bought in multiple orders, we do not always notice they were bought by the same person unless we are notified by the buyer.) We refund extra shipping charges when combined shipping is requested. If we ship items separately, we do not issue a shipping refund.
For our International customers: YES!! we do combine shipping. The most economical way for you to buy multiple items from us is for you to send us a list of the items you want to buy. Do not purchase them as they are listed!! (This leads to higher than necessary fees & shipping.) Send us a complete list of all the items you want. Then we will cancel the listings for the items and turn them into a special listing just for you (We'll send you the listing named before making it active). It will have your full purchase with the correct shipping box size and weight. This saves you on the international fees & shipping.