Question: In a certain three-branch parallel circuit, R1 has 12 mA through it, R2 has 15 mA through it, and R3 has 25 mA through it. After measuring a total of 27 mA, you can say that____________?

• 1. R3 is open
• 2. R1 is open
• 3. R2 is open
• 4. the circuit is operating properly

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

• 1. 25 Ω
• 2. 500 Ω
• 3. 100 Ω
• 4. 20 Ω

Question: 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_______________?

• 1. 22 mA
• 2. 120 mA
• 3. 220 mA
• 4. 50 mA

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

• 1. 790 Ω
• 2. 470 Ω
• 3. 60 Ω
• 4. 30 Ω

Question: 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______________?

• 1. 12.5 Ω
• 2. 200 Ω
• 3. 20 KΩ
• 4. 50 Ω

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

• 1. greater than 1.6 kΩ
• 2. greater than 120 but less than 1.6 kΩ
• 3. less than 120 but greater than 100 Ω
• 4. less than 100 Ω

Question: 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___________?

• 1. 55 Ω
• 2. 5.5 Ω
• 3. 50 Ω
• 4. 9 Ω

Question: Four 8 Ω speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers_____________?

• 1. 18 W
• 2. 1.5 W
• 3. 48 W
• 4. 72 W

Question: A sudden increase in the total current into a parallel circuit may indicate______________?

• 1. a drop in source voltage
• 2. an open resistor
• 3. an increase in source voltage
• 4. either a drop in source voltage or an open resistor

Question: Three 47 Ω resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximately_______________?

• 1. 2.3 A
• 2. 780 mA
• 3. 47 mA
• 4. 7.06 A