The International System of Units (SI), commonly known as the metric system, is the international standard for measurement. The SI plays an essential role in international commerce and is commonly used in scientific and technological research and development. This cache is part of the SI geoart that allows you to learn about the SI units. Visit the introduction cache to learn more about this geoart.
Electric potential difference: volt (V)
The volt is the SI base unit of electric potential, electric potential difference, and electromotive force. It is defined as the difference in electric potential between two points of a conducting wire when an electric current of one ampere dissipates one watt of power between those points. Electric potential difference, one of the measured quantities, is also named voltage.
Mains electricity in different countries may have different voltages and frequencies. For example:
- Japan: 100V 50Hz.
- United States: 120V 60Hz.
- China: 220V 50Hz.
- Italy: 230V 50Hz.
Consequently, appliances sold in one country may not work in another country.
Batteries, on the other hand, are fairly universal:
- Alkaline battery: 1.5V.
- Cellphone battery: 3.7V.
- USB power bank: 5V.
Therefore, you can use a battery from any country to open gadget caches, as long as they have the same voltage!
Electrical capacitance: farad (F)
The farad is the SI derived unit of electrical capacitance. It is defined as the capacitance across which, when charged with one coulomb, there is a potential difference of one volt.
Electrical capacitance is the ability of a body to store an electrical charge. A “body” designed to store electrical charge is called a capacitor. In general electronics design, capacitor values range from 1 picofarad (pF) (10-12F) to 1 millifarad (mF) (10-3F).
A supercapacitor is a high-capacity capacitor. Its capacity can be over 100F, enough for operating a vehicle. While a supercapacitor can store much less energy than a battery, they can recharge very fast, so they are suitable for city buses that stop frequently at fixed locations.
A flux capacitor is a device that enables time travel. yoursunny is unable to find specifications of its capacity in farads.
This Geocache
What’s the voltage used by the tram system near GC3PBQ2? Multiply by ⅚ to get ABC.
188 microamperes of electric current flows into an uncharged capacitor for 601298 nanoseconds, it gains a potential difference of 236 volts. What’s the capacitance in picofarads? Round to an integer to get DEF.
Final coordinates: N 39° 08.ABC W 077° 08.DEF
You can validate your puzzle solution with certitude.
Cache container is a baby-nano with tiny log sheet. A pair of tweezers is mandatory for log retrieval. To conserve space, please omit the date and write the first two letters of your username only.
Some hides are located along a road without sidewalk. For your safety, please walk on the grass out of the car lanes, and avoid going at night without wearing a safety vest.
Lists of Caches in SI geoart
- introduction
- second and hertz
- metre
- kilogram
- m/s and km/h
- mole
- radian and steradian
- m/s² and newton
- m² and pascal
- joule and watt
- ampere and coulomb
- volt and farad
- ohm
- kelvin
- candela, lumen, and lux
- bushel
- foreword & afterword
- prize distribution