13 KNOWLEDGE Quantities and units (continued) Quantity Legal units Units no longer approved Conversion factors/ Relationships Comments Name Symbol Name Symbol field strength, electrical magnetic volts divided by meters amperes divided by meters V/m A/m Oersted Oe 1 V/m 1 Oe = 1 m · kg/s3 · A = 1 W/A · m = 10 3 4π A/m SI unit SI unit area square meter m2 Are Hectare qm a ha 1 m2 1 a 1 ha = 1 m · 1 m = 102 m2 = 104 m2 SI unit flux, magnetic weber Wb Maxwell M 1 Wb 1 M = 1 V · s = 10-8 Wb SI unit flux density, electrical magnetic coulomb divided by square meter tesla C/m2 T Gauss G 1 T 1 G = 1 Wb/m2 = 1 V · s/ m2 = 10-4 T SI unit SI unit (formerly magnetic induction) frequency hertz Hz s-1 1 Hz =1 s-1 SI unit for periodic cycles speed meters divided by seconds kilometers divided by hours m/s km/h 1 km/h = 0,27 m/s SI unit inductance, electrical/electro- magnetic henry H Internat. henry Hint 1 H 1 Hint = 1 Wb/A = 1 V · s/A = 1 W · s/A2 = 1 Ω · s = 1,00049 H SI unit ion dose coulomb divided by kilogram C/kg Röntgen R 1 R = 2,58 · 10-4 C/kg SI unit capacitance, electrical farad F Internat. Farad Fint 1 F 1 Fint = 1 C/V = 1 A2 · s/W = 1 s/Ω = 0,99951 F SI unitt force newton N Pond Dyn p dyn 1 N 1 kp 1 dyn = 1 kg · m/s2 = 9,807 N = 10-5 N SI units charge, electrica coulomb C 1 C = 1 A · s = 1 J/V SI unit (also called quantity of electricity) length (distance, height) meter m Micron Ångström Fermi Zoll µ Å f " 1 µ 1 Å 1 f 1" = 10-6 m = 10-10 m = 10-15 m = 25,4 mm SI basic unit power watt W Horsepower HP 1 W 1HP = 1 J/s = 0,735 kW SI unit conductivity, length related siemens divided by centimeter S/cm 1 S/cm = 1 Ω-1 · cm-1 SI unit conductivity is conductance divided by length, usually expressed in µS/cm siemens S 1 S = 1 Ω-1 SI units
RkJQdWJsaXNoZXIy MTIxNDc3OQ==