Equivalent resistance for resistors in parallel:
Equivalent resistance for resistors in series:
The 20Ω and 60Ω resistors are in series:
R20,60 = R1 + R2 = 20 + 60 = 80Ω
Consider the circuit shown in (Figure 1) . Suppose that ε = 25V.
What is the current through the battery when the switch is open?
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