# 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

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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

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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

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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