Equivalent resistance for resistors in parallel:
Equivalent resistance for resistors in series:
When the switch is closed, (20Ω and 40Ω) and (60Ω and 10Ω) resistors are in parallel.
The combinations are then placed in series.
Consider the circuit shown in (Figure 1) . Suppose that ε = 25V.
What is the current through the battery when the switch is closed?
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