Note : In series current remain constant.
In parallel voltge remain constant.
Given,
Three identical resistors connected in series, each with resistance R.
Connected to a battery of voltage, V = 12 V
Equivalence resistance, Req = R + R + R
Req = 3R
Current I = V/Req
I = 12/3R
I = 4/R
Voltage across each resistors, V' = IR
V' = (4/R)R
V' = 4 V
Answer : 4V
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