# Parallel Circuits

• ## The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is_____.

• A. 1 A
• B. 7 A
• C. Unknown
• D. The larger of the two
Explanation:

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• ## In a five-branch parallel circuit, there are 12 mA of current in each branch. If one of the branches opens, the current in each of the other four branches is_____.

• A. 48 mA
• B. 12 mA
• C. 0 A
• D. 3 mA
Explanation:

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• ## A sudden increase in the total current into a parallel circuit may indicate_____.

• A. A drop in source voltage
• B. An open resistor
• C. An increase in source voltage
• D. Either a drop in source voltage or an open resistor
Explanation:

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• ## The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation is_____.

• A. 1.2 W
• B. 4.8 W
• C. 0.3 W
• D. 12 W
Explanation:

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• ## Total power in a parallel circuit is found by adding up the power of all the individual resistors.

• A. True
• B. False
Explanation:

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• ## Six resistors are in parallel. The two lowest-value resistors are both 1.2 kΩ. The total resistance_____.

• A. Is less than 6 kΩ
• B. Is greater than 1.2 kΩ
• C. Is less than 1.2 kΩ
• D. Is less than 600 Ω
Explanation:

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• ## There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 mA. The current through the fourth resistor is_____.

• A. 490 mA
• B. 800 mA
• C. 310 mA
• D. 0 A
Explanation:

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• ## The sum of the currents into a junction is equal to the sum of the currents out of that junction.

• A. True
• B. False
Explanation:

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• ## The following resistors are in parallel across a voltage source: 220 Ω, 470 Ω, and 560 Ω. The resistor with the least current is_____.

• A. 220 Ω
• B. 470 Ω
• C. 560 Ω
• D. Impossible to determine without knowing the voltage
Explanation:

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• A. 2.3 A
• B. 780 mA
• C. 47 mA
• D. 7.06 A