Page 60 - LISTRIK DINAMIS 1_Neat

4. Diketahui : P = 100 Watt ;
V = 220 V

Ditanya : R = ......

Jawab : P =  R = = = 484 

5. Diketahui : P = 350 W ;
V = 220 V ;
t = 4 h

Ditanya : energi dalam KWh, W = ........

Jawab : W = P . t = (350) (4)
W = 1400 kWh
W = 1,4 kWh

6. Diketahui : h = 100 m, = 50 m s
3 –1
–2
g = 10 ms ,
P = 1000 kg m –3
= 8090 = 0,8

Ditanya : daya listrik P = ?

Jawab : P = = h = g h

P = (0,8) (1000) (50) (10) (100)
6
P = 40 . 10 W
P = 40 MW

7. Diketahui : P = 100 W, V = 220 V,
t = 1200 s, m = 5 liter
0
0
To = 30 C, c = 4200 J/kg C

Ditanya : Suhu akhir, T = ........

Jawab : P. t = m c 

 = = = 5,7 C
0
Suhu akhir, T = T0 + 
T = 3 C + 5,7 C
0
0
T = 35,7 C
0

60