Txoj haujlwm ntawm them piles rau cov hluav taws xob tshiab hluav taws xob tsheb zoo ib yam li cov roj nyob hauv cov chaw sam roj. Lawv tuaj yeem tsim kho rau hauv av lossis phab ntsa thiab teeb tsa hauv cov tsev pej xeem (tsev pej xeem, khw khw, chaw nres tsheb pej xeem, thiab lwm yam) thiab cov chaw nres tsheb hauv chaw nres tsheb lossis chaw nres tsheb them. Sib txawv voltage theem them ntau hom hluav taws xob tsheb.
Lub tuam txhab tau cog lus los muab cov qhua tuaj noj mov nrog kev tshaj lij, ib puag ncig, kev lag luam, thiab txhim khu kev qha technology thiab cov khoom lag luam, tsim kev ntseeg siab, kev koom tes, thiab yeej kev sib koom tes nrog cov neeg siv khoom, ua raws li kev coj ua thev naus laus zis, hom kev vam meej, kev ncaj ncees thiab kev ntseeg siab, thiab cov kev pabcuam siab txhawm rau pab kuv lub teb chaws hluav taws xob lub tsheb fais fab kev lag luam sai Tsim kho, lub teb chaws siv cov tswv yim tshiab kev siv zog, txhawb kev txuag hluav taws xob, txo kev tso tawm hluav taws xob thiab lub teb chaws'