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AP Physics 2
11.7 Kirchhoff’s Junction Rule
11.6 Kirchhoff’s Loop Rule
11.5 Compound Direct Current (DC) Circuits
11.3 Resistance, Resistivity, and Ohm’s Law
IntermediateMCQMathematicalConceptual16.4k
Circuit schematic with parallel branches and fuses.
Circuit schematic with parallel branches and fuses.
A DC power supply providing a constant potential difference of \(120\text{ V}\) is connected to a parallel distribution circuit. Branch 1 contains a resistor \(R_1 = 60\text{ }\Omega\) in series with Fuse 1, which is rated at \(3.0\text{ A}\). Branch 2 contains a variable load resistor \(R_v\) in series with Fuse 2, which is rated at \(2.5\text{ A}\). A main Fuse 3, rated at \(4.0\text{ A}\), is located in the main line connected directly to the power supply. As the resistance of \(R_v\) is gradually decreased, which fuse will open first, and what is the maximum total current delivered by the power supply right before any fuse opens?

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