Circuit voltage

Calculate the closed-circuit voltage. Calculate the power on the resistors. R1 = 30 ohms, R2 = 10 ohms. I = 0.1A. U =?. The resistors are connected in series, one after the other.

Correct answer:

P1 =  0.3 W
P2 =  0.1 W
U =  4 V

Step-by-step explanation:

R1=30 Ω R2=10 Ω I=0.1 A  U1=I R1=0.1 30=3 V  P1=U1 I=3 0.1=0.3 W
U2=I R2=0.1 10=1 V P2=U2 I=1 0.1=0.1 W
U=U1+U2=3+1=4 V

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