# uliza swali lolote kuhusu Electronics design na electronics kwa ujumla nikujibu!

#### Transistor

##### JF-Expert Member
Uliza swali lolote la electronics!

#### Zugak17

##### JF-Expert Member
Ktk transformer za tanesco. Huwa naona wameandika ...KVA. hyo KVA inamaanisha nn? (Najua kugoogle)

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#### clinical pharmacology2

##### JF-Expert Member
1)Briefly explain the following terms;

.Transistor
.Diode

2)Why my smart phone become hot when I use it for long time??

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#### ymollel

##### JF-Expert Member
Uliza swali lolote la electronics!
Kitambo sana sijakusikia humu...

Swali 1:
-ni Voltage kiasi gani na Current kiasi gani inayohitajika kuchaji lead acid battery yenye 12V, 7.2AH

Swali 2:
linahusu kucharge Li ion/Polymer battery
-ni Voltage kiasi gani na Current kiasi gani inayohitajika kuchaji Li ion/polymer battery yenye 3.7V, 2000mAH

#### Transistor

##### JF-Expert Member
Kilo Voltage Ampere

Ni kipimo cha wattage ya transformer.

Kva=Voltage x Current/1000

Kilo = ni kipimo katika maalfu

1kilo = 1000

Hivyo VA 1000 ni sawa na kusema 1KVA

Hivyo ukiona kipimo kipo katika K maana kipo katika maalfu.

1KVA = 1000 VA

#### Transistor

##### JF-Expert Member
Ktk transformer za tanesco. Huwa naona wameandika ...KVA. hyo KVA inamaanisha nn? (Najua kugoogle)

Sent using Jamii Forums mobile app
Ktk transformer za tanesco. Huwa naona wameandika ...KVA. hyo KVA inamaanisha nn? (Najua kugoogle)

Sent using Jamii Forums mobile app
Kilo Voltage Ampere

Ni kipimo cha wattage ya transformer.

Kva=Voltage x Current/1000

Kilo = ni kipimo katika maalfu

1kilo = 1000

Hivyo VA 1000 ni sawa na kusema 1KVA

Hivyo ukiona kipimo kipo katika K maana kipo katika maalfu.

1KVA = 1000 VA

#### Zugak17

##### JF-Expert Member
Kilo Voltage Ampere

Ni kipimo cha wattage ya transformer.

Kva=Voltage x Current/1000

Kilo = ni kipimo katika maalfu

1kilo = 1000

Hivyo VA 1000 ni sawa na kusema 1KVA

Hivyo ukiona kipimo kipo katika K maana kipo katika maalfu.

1KVA = 1000 VA
Kwamba 200KVA sawa na wats ngap? Au hamna uhusiano hapo?

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#### Transistor

##### JF-Expert Member
Kitambo sana sijakusikia humu...

Swali 1:
-ni Voltage kiasi gani na Current kiasi gani inayohitajika kuchaji lead acid battery yenye 12V, 7.2AH

Swali 2:
linahusu kucharge Li ion/Polymer battery
-ni Voltage kiasi gani na Current kiasi gani inayohitajika kuchaji Li ion/polymer battery yenye 3.7V, 2000mAH
12v yenye 7.2ah
Chukua 7.2ah / 10h =

0.72ampere as charging current.

13.5v as charging voltage

2000mAH/3h =600mAH

Charging volage 5voltage

#### Transistor

##### JF-Expert Member
Kwamba 200KVA sawa na wats ngap? Au hamna uhusiano hapo?

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200kva = 200,000 watt roughly (japo kupata clear wattage kuna vitu vingi vya kuazingatia)

#### Transistor

##### JF-Expert Member
asante ndugu pia naitaji kujua tofauti kati ya KW na KVA

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Kw = kva ( japo KW nisawa na mafuta yalio safishwa,KVA ni sawa na mafuta machafu).

Kupata KW lazma u calculate efficiency ya kifaa husika pamoja na energy loss (energy ambayo inapotea bila kufanya kazi)

Power factor ni muhimu kuicalculate kabla ya kupata KW hasa katika umeme wa AC

#### ymollel

##### JF-Expert Member
12v yenye 7.2ah
Chukua 7.2ah / 10h =

0.72ampere as charging current.

13.5v as charging voltage

2000mAH/3h =600mAH

Charging volage 5voltage
hiyo 13.5V na hiyo 5V zinapatikanaje? au ni fixed values kwa hizo battery?

#### Transistor

##### JF-Expert Member
hiyo 13.5V na hiyo 5V zinapatikanaje? au ni fixed values kwa hizo battery?
Kuna kitu kinaitwa rule of thumb...ambapo charging voltage hua ni battery voltage +10% ya volage yake.

3.7V =3.7v+ 10% yake
3.7v=3.7 +0.37= 4.07 round to high value = 4.5 or 5v

12v= 12v + 1.2 = 13.2 round to high volue 13.5 or 14v

#### zakayoyoung

##### Senior Member
Mkuu nami tataka unisaidie hapaa

Jinsi na namna ya uziunganisha IC mbili aina ya TDA2030 ili zitoe sauti kwa pamoja katika amplifier
Maana nimetengeneza amplifier kwa kutumia IC moja ya tda2030 imetoa sauti nzuri lakini output yake imetoa watt 15 tu na ndio maana nataka nifahamu namna ya kuziunganisha IC mbili ili output itoe hata watt 35 mkuu kama unayaweza haya mambo nisaidie

#### kofuli

##### JF-Expert Member
KUHUSU ELECTRONIC DEVICES: mobile signal booster naishi kwenye bonde kiasi kwamba mpaka sasa nipo baa mtaa wa tatu natuma hii txt ndio niende nyumbani asubuhi ndio nikute majibu ya MOBILE SIGNAL BOOSTER

#### zakayoyoung

##### Senior Member
KUHUSU ELECTRONIC DEVICES: mobile signal booster naishi kwenye bonde kiasi kwamba mpaka sasa nipo baa mtaa wa tatu natuma hii txt ndio niende nyumbani asubuhi ndio nikute majibu ya MOBILE SIGNAL BOOSTER
Tumia IC lm386 Ku create hio signal booster ni rahisi sana mkuu

#### MEING'ATI

##### JF-Expert Member
Hii iko bomba Sema unapoteaga sana. Naomba utuekeze Tofauti ya kuwa na matatizo kwa Crt pamoja na Ic proseser ya tv

#### zakayoyoung

##### Senior Member
Hii iko bomba Sema unapoteaga sana. Naomba utuekeze Tofauti ya kuwa na matatizo kwa Crt pamoja na Ic proseser ya tv