Em hy k tn mt s loi dng in gia nh loi in - nhit m em bit?Hy nu
nguyn l lm vic ca cc dng in ny?NI CM INM INBN L INBP IN
Nguyn l hot ng ca dng loi in - nhit220VK
Da vo tc dng nhit ca dng in chy trong dy t nng, bin i in nng
thnh nhit nng.I. Nguyn l lm vic2. Dy t nnga. in tr ca dy t nngCng
thc: Trong : R: l in tr. n v: (m): l in tr sut.n v: m (m - Mt)l: l
chiu di. n v: m (Mt)S: l tit din. n v: mm2 * Lu : i n v tit din
1mm2=10-6m2.
Da vo tc dng nhit ca dng in chy trong dy t nng, bin i in nng
thnh nhit nng.I. dng loi in nhitI. Nguyn l lm vic2. Dy t nnga. in
tr ca dy t nngb. Cc yu cu k thut ca dy t nng- Dy t nng lm bng vt
liu dn in c in tr sut nh, chu nhit cao nh : nikencrm, phercrm, . .
.
NM IU CHNH NHIT NPDY T NNG
II. Bn l inI. Cu to- Dy t nng c lm bng hp kim niken crm chu c
nhit cao.- Dy t nng c t rnh trong bn l v cch in vi v.Dy t nng c lm
bng vt liu g?Dy t nng c t u trong bn l?a. Dy t nng
II. Bn l inI. Cu tob. V bn l- c lm bng gang hoc hp kim nhm.- Np
c lm bng ng, thp m crm hoc nha chu nhit, trn c gn tay cm bng nha
cng chu nhit.- Ngoi ra cn c n tn hiu, r le nhit, nm iu chnh nhit ,
b phn iu chnh nhit v phun nc.
II. Bn l inI. Cu to* Tm hiu r le nhit1. R-le nhit l ng dng ca
hin tng vt l no?2. R-le nhit c tc dng g trong bn l?- R-le nhit l ng
dng ca hin tng gin n v nhit.- Rle nhit c s dng t ng ng ct mch in
khi t n mt nhit yu cu.b. V bn l
* Tm hiu r le nhitVt iu chnhThanh lng kim (Bng kp)AO
2. Nguyn l lm vic- Khi ng in, dng in chy trong dy t nng to nhit,
nhit c tch vo ca bn l lm nng bn l.
3. Cc s liu k thut- in p nh mc : 127V, 220V.- Cng sut nh mc :
300W 1000W.
4. S dng- S dng ng vi in p nh mc ca bn l.- Khi ng in khng c mt
bn l trc tip xung bn hoc lu trn qun o.- iu chnh nhit cho ph hp vi
tng loi vi, la, . . . cn l, trnh lm hng vt dng c l.- Gi gn mt bn l
sch v nhn.- m bo an ton v in v v nhit.
I E N N A N G B A N U IB E P I E N R L E N H I E T7B U T T H I E
NT12I N H I E T N A N G6H 5N 4N 3E8E N O I C M I E N D A Y I E N T
R 9N I K E N C R O M ITn gi khc ca dy t nngVt liu c nhit lm vic t
1000 n 1100oCThit b t ng ct in khi nngTn gi khc ca bn l inNng lng u
vo ca dng inNng lng u ra ca thit b t nngDng c dng kim tra chm mch,
r inS dng un, nu thc phmLoi dng in c soong I E N N H I E T
