Sertakan caranya ...........

No. 15 
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Diket :
Generator
Arus, i = 100 Ampere
Tegangan, V = 110 Volt

Daya hilang, P hilang = 1,65 kWatt = 1650 watt

Tanya :
efisiensi generator, η = __?

Jawab :

Step 1
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Hitung dulu daya input generator, P in = __?
Gunakan rumus :
P in = V.i
P in = 110 . 100
P in = 11000 watt

Step 2
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Hitung daya yang terpakai, P out = __?
Gunakan rumus :
P in = P out + P hilang
11000 = P out +  1650
P out = 11000 - 1650
P out = 9350 watt

Step 3
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efisiensi generator, η = __?
Gunakan rumus :
η = [P out / P in] x 100%
η = [9350 / 11000] x 100%
η = [ 0,85 ] x 100%
η = 85%

Jawaban : D

No. 16
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Diket :
Luas penampang kumparan, A = 100 cm² = 100 x 10⁻⁴ m²
Hamnatan, R = 4 ohm
Jumlah lilitan, N = 400 lilitan
Medan magnet, B = 10⁻⁴. Sin 2000.t 
kecepatan sudut, ω = 2000 rad/s
Medan magnet maksimum, B max = 10⁻⁴ Tesla

Tanya :
Arus induksi maksimum, i max = __?

Jawab :
step 1
--------
hitung dulu GGL induksi maksimum, V max = __?
ε max = N . B max . A . ω
ε max = [400].[10⁻⁴].[100 x 10⁻⁴].[2000]
ε max = 0,8 Volt

Step 2
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i max = ε max / R
i max = 0,8 / 4
i max = 0,2 Ampere
i max = 200 mA

Jawaban : E


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