Parallel Circuits – Exercise – 1

21. The following currents are measured in the same direction in a three-branch parallel circuit: 200 mA, 340 mA, and 700 mA. The value of the current into the junction of these branches is ________.

(a) 200 mA
(b) 540 mA
(c) 1.24 A
(d) 900 mA

Answer
Answer : (c)
Explanation
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22. 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

Answer
Answer : (a)
Explanation
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23. If there are a total of 120 mA into a parallel circuit consisting of three branches, and two of the branch currents are 40 mA and 10 mA, the third branch current is ________.

(a) 50 mA
(b) 70 mA
(c) 120 mA
(d) 40 mA

Answer
Answer : (b)
Explanation
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24. 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

Answer
Answer : (b)
Explanation
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25. Three lights are connected in parallel across a 120 volt source. If one light burns out, ________.

(a) the remaining two will glow dimmer
(b) the remaining two will glow brighter
(c) the remaining two will not light
(d) the remaining two will glow with the same brightness as before

Answer
Answer : (d)
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