# Parallel Circuits – Exercise – 1

Parallel Circuits » Exercise – 1

1. When an additional resistor is connected across an existing parallel circuit, the total resistance ________.

(a) remains the same
(b) decreases by the value of the added resistor
(c) increases by the value of the added resistor
(d) decreases

Explanation
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2. 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

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3. When a 1.6 kΩ resistor and a 120 Ω resistor are connected in parallel, the total resistance is ________.

(a) greater than 1.6 kΩ
(b) greater than 120 Ω but less than 1.6 kΩ
(c) less than 120 Ω but greater than 100 Ω
(d) less than 100 Ω

Explanation
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4. An ammeter has an internal resistance of 50 Ω. The meter movement itself can handle up to 1 mA. If 10 mA is applied to the meter, the shunt resistor, RSH1, is approximately ________.

(a) 55 Ω
(b) 5.5 Ω
(c) 50 Ω
(d) 9 Ω

Explanation
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5. The total resistance of a parallel circuit is 50 Ω. If the total current is 120 mA, the current through the 270 Ω resistor that makes up part of the parallel circuit is approximately ________.

(a) 22 mA
(b) 120 mA
(c) 220 mA
(d) 50 mA

Explanation
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