A 75-W lightbulb and a 60-W lightbulb are connected to a 120-V source. Determine

Question

A 75-W lightbulb and a 60-W lightbulb are connected to a 120-V source. Determine the voltage across each lightbulb if they are connected in series and in parallel.
Answer:
In series 75-W _____ V 60-W _____V
In parallel 75-W _____ V 60-W _____V A 75-W lightbulb and a 60-W lightbulb are connected to a 120-V source. Determine the voltage across each lightbulb if they are connected in series and in parallel.
Answer:
In series 75-W _____ V 60-W _____V
In parallel 75-W _____ V 60-W _____V A 75-W lightbulb and a 60-W lightbulb are connected to a 120-V source. Determine the voltage across each lightbulb if they are connected in series and in parallel.
Answer:
In series 75-W _____ V 60-W _____V
In parallel 75-W _____ V 60-W _____V In parallel 75-W _____ V 60-W _____V

Explanation / Answer

In series

I = V/(R1+R2)

V1 = I*R1 = V*R1/(R1+R2)

P1 = I^2*R1======> R1 = I^2/P1

P2 = I^2*R2 =============> R2 = I^2/P2

V1 = vP2/(P1+P2) = (120*60)/(75+60)

V1 = 53.33 V

+++++++++++++

V2 = V - V1 = 120 - 53.3 = 66.7 v

++++++++++++++++++++++

In parallel

V1 = V2 = 120 v

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