Using nominal power and voltage of lamps find lamps' resintance:
P=I×U=U2RP=I\times U=\frac{U^2}{R}P=I×U=RU2
R=U2PR=\frac{U^2}{P}R=PU2
R1=2502100=625OhmR_{1}=\frac{250^2}{100}=625OhmR1=1002502=625Ohm
R2=2002100=400OhmR_{2}=\frac{200^2}{100}=400OhmR2=1002002=400Ohm
Current in circuit:
I=UR1+R2=250625+400=0.244AI=\frac{U}{R_{1}+R_{2}}=\frac{250}{625+400}=0.244AI=R1+R2U=625+400250=0.244A
Lamps' voltage:
U=I×RU=I\times RU=I×R
U1=I×R1=0.244×625=152.5VU_{1}=I\times R_{1}=0.244\times 625=152.5VU1=I×R1=0.244×625=152.5V
U2=I×R2=0.244×400=97.6VU_{2}=I\times R_{2}=0.244\times 400=97.6VU2=I×R2=0.244×400=97.6V
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