Problem: Consider the circuit shown in (Figure 1) . Suppose that ε = 25V. What is the current through the battery when the switch is closed?

FREE Expert Solution

Equivalent resistance for resistors in parallel:

1Req=1R1+1R2+...+1Rn

Equivalent resistance for resistors in series:

Req=R1+R2+...+Rn

Ohm's law:

V=iR

When the switch is closed, (20Ω and 40Ω) and (60Ω and 10Ω) resistors are in parallel.

The combinations are then placed in series.

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Problem Details

Consider the circuit shown in (Figure 1) . Suppose that ε = 25V. 

20 Ω 40 S2 Switch 60 Ω 10Ω

What is the current through the battery when the switch is closed?

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