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2. 25 watt = 25/1000 Kw
= 0,025 Kw
3. P= V.i
= 220. 50/1000
= 11 W
4. P = 375+50 = 425 W
P = V. i --> i = P/V
= 425 / 220
= 1,93 A
= 0,00193 mA
7. W = V.i.t --> v= i.R
= i.R. i.t
= i² R.t
= 3².5.15
= 675 J
8. W = V.i.t
= 220. 2. (0,5.3600)
= 220. 3600
= 792000 J
= 792 Kj
gambar 3
1. W = V.i..t
= 3,5. 0,25 . (10.60)
= 525 J
2. 4 lampu = 4 x 25 = 100 W
TV = 100 W
kipas angin = 50 W
---------------+
P = 250 W
W= P. t
= 250 . (10)
= 2500 Wh
= 2,5 Kwh
biaya = 2,5 x Rp. 250 x 30 hari
= Rp. 18.750
4. a. V = I. R
= 0,5 . 440
= 220 V
b. W = V.i..t
= 220. 0,5. 30 menit
= 110. (30.60s)
= 198000 J
= 198 Kj
c. P = V.i
= 220. 0,5
= 110 W