Power - matsaloli da mafita

Ƙarfi shine ƙimar da ake yin aiki a cikin wani lokaci da aka ƙayyade. A lissafi, ƙarfi shine rabon aiki/lokaci.

P = W/t

Bayani: P = iko (Joule/daƙi = Watt), W = aiki (Joule), t = tazara lokaci (daƙi)

Dangane da wannan lissafi, za a iya kammala da cewa mafi girman aikin, mafi girman ƙarfin. A gefe guda kuma, ƙaramin aikin, mafi ƙarancin ƙarfin. Yawan aiki yana nufin ƙimar da ake yi aiki.

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Ƙarfi sikeli ne. Naúrar SI ta iko ita ce Joule/daƙiya. Joule/daƙiya = Watt (an taƙaita ta da W), an sanya mata suna don girmama James Watt. Naúrar mulkin mallaka ta Burtaniya don iko tana da ƙafa-fam a kowace daƙiƙa.

Wannan na'urar ta yi ƙanƙanta sosai don amfani mai amfani, don haka ana amfani da babban ƙarfin dawaki na na'urar (wanda aka taƙaita shi da hp). Doki ɗaya = ƙafa 550-fam a kowace daƙiƙa = Watt 764 = ¾ kilowatt.

Ana iya bayyana adadin aikin a cikin na'urorin lokaci x na wutar lantarki, misali, kilowatt-hours ko kWh. KWh ɗaya yana nufin aikin da aka yi a matsakaicin ƙimar kilowatt 1 na awa ɗaya.

1. Mutum mai nauyin kilogiram 50 yana gudu a kan matakala tsawon mita 10 cikin mintuna 2. Saurin gudu saboda nauyi (g) shine 10 m/ s ^2. Kayyade ƙarfin.

An sani:

Nauyi (m) = 50 kg

Tsawo (h) = mita 10

Saurin gudu saboda nauyi (g) = 10 m/s ²

Tazarar lokaci (t) = minti 2 = 2 (60) = daƙiƙa 120 a minti ɗaya

Ana nema : Ƙarfi (P)

Magani:

Tsarin iko:

P=W/t

P = iko , W = aiki , t = lokaci

Tsarin Aiki:

W = Fs = wh = mgh

W = aiki , F = ƙarfi , w = nauyi , d = matsuguni , h = tsayi , m = taro, g = hanzari saboda nauyi

W = mgh = (50)(10)(10) = Joules 5000.

P = W / t = 5000 / 120 = 41.7 Joules/se c akan d.

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2. Lissafa ƙarfin da ake buƙata ga mutum mai nauyin kilogiram 60 wanda ya hau bishiya tsawon mita 5 cikin daƙiƙa 10. Saurin da ake samu sakamakon nauyi shine mita 10/s ².

An sani:

Nauyi (m) = 60 kg

Tsawo (h) = mita 5 a sakan daya

Saurin gudu saboda nauyi (g) = 10 m/s ²

Tazarar lokaci (t) = daƙiƙa 10

Ana nema : Iko

Magani:

Aiki:

W = mgh = (60)(10)(5) = Joules 3000

Ikon:

P = W / t = 3000 / 10 = Joules 300/se cond.

3. Barkwanci mai juyawa mai ƙarfin watts 300 da kuma tsawon mintuna 5 yana juyawa da zagaye 5. Ƙarfin da yake amfani da shi shine….

A. 15 kJ

B. 75 kJ

C. 90 kJ

D. 450 kJ

An sani:

Ƙarfi (P) = Watts 300 = Joules 300/daƙiƙa

Lokaci (T) = mintuna 5 = daƙiƙa 5 (daƙiƙa 60) = daƙiƙa 300

Adadin juyawa = 5

Ana so: Makamashin da barkwancin rotary ke amfani da shi

Magani:

Amsar da ta dace ita ce D.

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1. An yi aikin ne ta hanyar amfani da hanyoyin magance matsalolin da kuma hanyoyin magance su
2. Matsalolin makamashin aiki da kuma mafita da mafita
3. Matsaloli da mafita na ƙa'idodin makamashin aiki-injini
4. Matsalolin makamashi masu yuwuwar nauyi da mafita
5. Ƙarfin da ke tattare da matsalolin bazara masu laushi da mafita
6. Matsalolin wutar lantarki da mafita
7. Amfani da kiyaye makamashin injiniya don motsi na faɗuwa kyauta
8. Amfani da kiyaye makamashin injiniya don motsi sama da ƙasa a cikin motsi na faɗuwa kyauta
9. Amfani da kiyaye makamashin injiniya don motsi a kan saman da ke lanƙwasa
10. Amfani da kiyaye makamashin injiniya don motsi a kan jirgin sama mai karkata
11. Amfani da kiyaye makamashin injiniya don motsi mai ƙarfi