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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
A schematic diagram of a DC circuit. On the left, a DC power supply labeled 120 V is connected in series with Fuse 3 (labeled 4.0 A) on the top main wire. The wire splits into two parallel vertical branches. The left branch contains Fuse 1 (labeled 3.0 A) in series with a resistor R1 = 60 ohms. The right branch contains Fuse 2 (labeled 2.5 A) in series with a variable resistor Rv. The circuit closes at the bottom wire back to the negative terminal of the power supply. No other labels, lines, text, or components appear.
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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