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How to Check if a Diode Is Bad Diodes are semiconductor devices that conduct current in one direction only, and are commonly made from silicon or germanium. Diodes have two terminals -- an anode and a cathode -- with the cathode being marked by a line painted on the body of the diode. Current is allowed to flow from the anode to the cathode, but is blocked in the other direction. This property is used most commonly in rectifier circuits, which change alternating current to direct current. Diodes are also used to protect components in a circuit if the power is connected the wrong way around, blocking the flow of current to stop damage being caused. Although diodes rarely fail, it can happen if they are exposed to voltage or current above their rated limits. Things You'll Need Digital multimeter Soldering iron Desoldering braid Pliers Instructions Unsolder one leg of the diode if it is part of a circuit, otherwise the other components in the circuit may affect the resul...

How to Charge a Car Battery Through a Cigarette Lighter An automotive electrical system normally has one or more power accessory points. These accessory points are often cigarette lighter outlets. However, most vehicles manufactured since the 1990s contain dedicated power accessory outlets. Many automobiles have their cigarette lighter outlets wired so that the outlets only work when the automobiles are running. However, power accessory outlets are usually hardwired to the battery, and are always active. A power accessory outlet may also be used as a means to trickle charge an automobile battery. Some accessories, such as solar battery chargers, are designed to take advantage of the bidirectional nature of a hardwired power accessory outlet. Things You'll Need Automobile with hardwired power accessory outlet Solar battery charger with automotive cigarette lighter plug Instructions Place the solar battery charger, shiny-side up, on the automobile's dashboard....