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Resistors R 1 = 20 ohms, R 2 = 40 ohms, and R 3 = 60...

Resistors R 1 = 20 ohms, R 2 = 40 ohms, and R 3 = 60 ohms, are all connected in series with one another.
The combination of three resisters in series is now connected in parallel with a 240 ohm
resistor, and the resulting circuit is connected across an ideal 62.5 volt battery.
a) Find the equivalent resistance connected across the battery.
b) Find the potential across each of the four resistors, and the current through each.
c) Find the power dissipated by each of the four resistors.

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