Combining Resistors in Series & Parallel Video Lessons

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

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

The 20Ω and 60Ω resistors are in series:

R20,60 = R1 + R2 = 20 + 60 = 80Ω

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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 open?

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