Equivalent resistance for resistors in parallel:
or for 2 resistors:
Equivalent resistance for resistors in series:
R3 and R4 are in series:
R34 = R3 + R4 = 6.0 + 4.0 = 10.0 Ω
R2 and R34 are in parallel:
R234 = (1/R2 + 1/R34)-1 = (1/15 + 1/10)-1 = 6.0 Ω
For the circuit shown in the figure, find the current through resistor R3 =6.0 Ω (the top one) and the potential difference across resistor R3=6.0 Ω
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