When an additional resistor is connected across an existing parallel circuit, the total resistance____________?

Related Mcqs:

1. Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is______________?

   A. 60 mA
   B. 15 mA
   C. 135 mA
   D. 31.25 mA

2. Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is______________?

   A. 12.5 Ω
   B. 200 Ω
   C. 20 KΩ
   D. 50 Ω

3. A 470 Ω resistor, a 220 Ω resistor, and a 100 Ω resistor are all in parallel. The total resistance is approximately________________?

   A. 790 Ω
   B. 470 Ω
   C. 60 Ω
   D. 30 Ω

4. Four resistors of equal value are connected in parallel. If the total voltage is 15 V and the total resistance is 600 Ω, the current through each parallel resistor is____________?

   A. 25 mA
   B. 100 mA
   C. 6.25 mA
   D. 200 mA

5. When a 1.6 kΩ resistor and a 120Ω resistor are connected in parallel, the total resistance is____________?

   A. greater than 1.6 kΩ
   B. greater than 120 but less than 1.6 kΩ
   C. less than 120 but greater than 100 Ω
   D. less than 100 Ω

6. The total resistance of a parallel circuit is 50 Ω. If the total current is 120 mA, the current through the 270 Ω that makes up part of the parallel circuit is approximately_______________?

   A. 22 mA
   B. 120 mA
   C. 220 mA
   D. 50 mA

7. Five 100 Ω resistors are connected in parallel. If one resistor is removed, the total resistance is______________?

   A. 25 Ω
   B. 500 Ω
   C. 100 Ω
   D. 20 Ω

8. The following resistors are in parallel across a voltage source: 220Ω , 470Ω , and 560Ω . The resistor with the least current is______________?

   A. 220 Ω
   B. 470 Ω
   C. 560 Ω
   D. impossible to determine without knowing the voltage

9. A set of Christmas tree lights is connected in parallel across a 110 V source. The filament of each light bulb is 1.8 k. The current through each bulb is approximately___________?

   A. 610 mA
   B. 18 mA
   C. 110 mA
   D. 61 mA

10. Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately___________?

    A. 2.2 A
    B. 137 mA
    C. 1.8 A
    D. 9.09 A