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  電勢和電壓與防爆配電箱的電位密切相關,即參考點相對于電路參考點的電壓.電壓是電路中兩點之間的電位差,即UAB = UAB = UA UB.需要指出的是,電路中某些電勢的大小與基準點的選擇有關.換句話說,由于不同參考點的選擇,同一點的電位值也不同.例如,有兩個電源,一個是3V,一個是4.5V.

  如(ru)果(guo)他們的(de)后續(xu)系(xi)列，將一點(dian)(dian)(dian)接地,即點(dian)(dian)(dian)零電(dian)(dian)(dian)(dian)位參(can)考(kao)(kao)(kao)點(dian)(dian)(dian)，然后對7.5V的(de)電(dian)(dian)(dian)(dian)位C點(dian)(dian)(dian)，如(ru)果(guo)接地B點(dian)(dian)(dian)，零電(dian)(dian)(dian)(dian)位參(can)考(kao)(kao)(kao)點(dian)(dian)(dian)B點(dian)(dian)(dian)，那么C點(dian)(dian)(dian)電(dian)(dian)(dian)(dian)位4.5V，這意(yi)味(wei)著參(can)考(kao)(kao)(kao)點(dian)(dian)(dian)變化時，點(dian)(dian)(dian)潛在電(dian)(dian)(dian)(dian)路中(zhong)的(de)變化以及。需要注意(yi)的(de)是，雖然電(dian)(dian)(dian)(dian)路中(zhong)某一電(dian)(dian)(dian)(dian)勢的(de)大(da)小與參(can)考(kao)(kao)(kao)點(dian)(dian)(dian)的(de)選擇有(you)關，但電(dian)(dian)(dian)(dian)路中(zhong)任(ren)意(yi)兩點(dian)(dian)(dian)之間的(de)電(dian)(dian)(dian)(dian)位差與基準點(dian)(dian)(dian)的(de)選擇無關。所選電(dian)(dian)(dian)(dian)勢的(de)參(can)考(kao)(kao)(kao)點(dian)(dian)(dian)，為了計(ji)算電(dian)(dian)(dian)(dian)壓到參(can)考(kao)(kao)(kao)點(dian)(dian)(dian)，這個電(dian)(dian)(dian)(dian)壓值是點(dian)(dian)(dian)電(dian)(dian)(dian)(dian)位。
  在(zai)電(dian)路的(de)(de)(de)分(fen)(fen)析計算中(zhong)，尤其是(shi)防爆配電(dian)箱的(de)(de)(de)電(dian)子電(dian)路中(zhong)，通常采用(yong)電(dian)勢的(de)(de)(de)概(gai)念。使用(yong)功率位分(fen)(fen)析，有(you)時可以簡化問題(ti)。例如(ru)，對于晶體(ti)二極管,只(zhi)有(you)當(dang)它的(de)(de)(de)正電(dian)位高(gao)于負電(dian)位時，管才會(hui)導通，相反的(de)(de)(de)情況就是(shi)這樣.在(zai)討論(lun)晶體(ti)管的(de)(de)(de)工作狀態(tai)時,分(fen)(fen)析每個(ge)電(dian)極的(de)(de)(de)高(gao)電(dian)位和低電(dian)位也很(hen)重要。
  電(dian)(dian)路(lu)(lu)是電(dian)(dian)工(gong)學研究的(de)基(ji)本對象，掌(zhang)握(wo)電(dian)(dian)路(lu)(lu)的(de)基(ji)本理論是很有必要的(de)。但在(zai)電(dian)(dian)機、變壓器、繼電(dian)(dian)器、電(dian)(dian)工(gong)測(ce)量(liang)儀器和各種鐵磁元(yuan)件(jian)等電(dian)(dian)氣(qi)設(she)備中，不僅存(cun)在(zai)電(dian)(dian)路(lu)(lu)問(wen)題，還存(cun)在(zai)磁路(lu)(lu)問(wen)題。能夠分析(xi)電(dian)(dian)氣(qi)設(she)備，除了控制電(dian)(dian)路(lu)(lu)的(de)基(ji)本原理、磁路(lu)(lu)的(de)基(ji)本理論要掌(zhang)握(wo)；由于(yu)磁和電(dian)(dian)有著千絲萬縷的(de)聯系，磁與電(dian)(dian)的(de)關系，磁路(lu)(lu)和電(dian)(dian)路(lu)(lu)要研究為(wei)了研究磁電(dian)(dian)路(lu)(lu)和磁。
  磁場的特(te)性可以用(yong)下列基本物理量來表(biao)示(shi)，帶電體周(zhou)圍有一個電場，磁鐵周(zhou)圍有一個磁場。
  磁感(gan)應強(qiang)度(du)(du)B是表(biao)示(shi)磁場中磁場強(qiang)度(du)(du)和方向的(de)物理量。它是一(yi)個向量，磁場中的(de)磁感(gan)應強(qiang)度(du)(du)B的(de)方向是磁力(li)線的(de)切線方向，即小(xiao)磁針在那個點的(de)方向。其大小(xiao)的(de)公式(shi)可(ke)以(yi)表(biao)示(shi)為具有單(dan)位(wei)長度(du)(du)且垂直于磁場方向的(de)導體(ti)。當通過單(dan)位(wei)電(dian)流時，所(suo)接收的(de)力(li)稱為導體(ti)的(de)磁感(gan)應強(qiang)度(du)(du)B，防(fang)爆配電(dian)箱(xiang)的(de)另一(yi)個小(xiao)磁感(gan)應強(qiang)度(du)(du)單(dan)位(wei)是gauss Gs。

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