. ▁R ounding ▁on ▁a ▁log arith mic ▁scale ▁is ▁accomplished ▁by ▁taking ▁the ▁log ▁of ▁the ▁amount ▁and ▁doing ▁normal ▁round ing ▁to ▁the ▁nearest ▁value ▁on ▁the ▁log ▁scale . ▁ ▁For ▁example , ▁resist ors ▁are ▁supplied ▁with ▁preferred ▁numbers ▁on ▁a ▁log arith mic ▁scale . ▁For ▁example , ▁for ▁resist ors ▁with ▁ 1 0 ▁% ▁accuracy ▁they ▁are ▁supplied ▁with ▁nom inal ▁values ▁ 1 0 0 , ▁ 1 2 1 , ▁ 1 4 7 , ▁ 1 7 8 , ▁ 2 1 5 ▁etc . ▁If ▁a ▁calculation ▁indicates ▁a ▁res istor ▁of ▁ 1 6 5 ▁oh ms ▁is ▁required ▁then ▁log ( 1 4 7 )   =   2 . 1 6 7 , ▁log ( 1 6 5 )   =   2 . 2 1 7 ▁and ▁log ( 1 7 8 )   =   2 . 2 5 0 . ▁The ▁log arith m ▁of ▁ 1 6 5 ▁is ▁closer ▁to ▁the ▁log arith m ▁of ▁ 1 7 8 ▁therefore ▁a ▁ 1 7 8 ▁o hm ▁res istor ▁would ▁be ▁the ▁first ▁choice ▁if ▁there ▁are ▁no ▁other ▁consider ations . ▁ ▁Whether ▁a ▁value ▁ ▁r ounds ▁to ▁ ▁or ▁ ▁depends ▁upon ▁whether ▁the ▁squ ared ▁value ▁ ▁is ▁greater ▁than ▁or ▁less ▁than ▁the ▁product ▁. ▁The ▁value ▁ 1 6 5 ▁r ounds ▁to ▁ 1 7 8 ▁in ▁the ▁resist ors ▁example ▁because ▁ ▁is ▁greater ▁than ▁.