Equivalent resistance for resistors in parallel:
For 2 resistors in parallel:
Equivalent resistance for resistors in series:
Power in a circuit:
Label the resistors as below:
R4 and R5 are in parallel:
R45 = (20.0)(20.0)/(20.0 + 20.0) = 10.0Ω
R45 and R3 are in series:
R345 = 10.0 + 10.0 = 20.0Ω
In the circuit shown in the figure, all the resistors are rated at a maximum power of 1.20 W.
What is the maximum emf that the battery can have without burning up any of the resistors?
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