Answer to Question #150200 in Electric Circuits for TumeloMadubeko

Question #150200
A 100W,250V lamp is connected in series with a 100W,200V lamp across a 250V supply mains. Calculate the current drawn from the supply mains and voltage across each lamp. Assume lamp resistance.
1
Expert's answer
2020-12-10T11:01:58-0500

Using nominal power and voltage of lamps find lamps' resintance:

P=I×U=U2RP=I\times U=\frac{U^2}{R}

R=U2PR=\frac{U^2}{P}

R1=2502100=625OhmR_{1}=\frac{250^2}{100}=625Ohm

R2=2002100=400OhmR_{2}=\frac{200^2}{100}=400Ohm

Current in circuit:

I=UR1+R2=250625+400=0.244AI=\frac{U}{R_{1}+R_{2}}=\frac{250}{625+400}=0.244A

Lamps' voltage:

U=I×RU=I\times R

U1=I×R1=0.244×625=152.5VU_{1}=I\times R_{1}=0.244\times 625=152.5V

U2=I×R2=0.244×400=97.6VU_{2}=I\times R_{2}=0.244\times 400=97.6V


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