Cara menghitung nya bagaimana ya? ​

12 w = 40 persen daya primer

kuat arus = P/V

V primer = 120

40 / 60 persen = 12 W / X

2/3 = 12/x

2x = 36

x = 18 w

P daya 60 persen = 18 W

P daya 100 persen = 18 + 12 = 30

kuat arus = P Daya /V

= 30/120

I arus primer = 0.25 amper