Circuits - Series vs Parallel

If a 15 ohm resistor is connected in parallel with a 30 ohm resistor, what is the equivalent resistance?

• 2.0 ohms
• 10. ohms
• 15 ohms
• 25 ohms

Three resistors of 20. ohms, 30. ohms, and 60. ohms are connected in series with a battery. A current of 2 amperes will flow through this circuit when the potential difference of the battery is 

• 10. V
• 220 V
• 110 V
• 20. V 

Two identical resistors connected in series have an equivalent resistance of 4 ohms. The same two resistors, when connected in parallel, have an equivalent resistance of 

• 8 Ohms
• 2 Ohms
• 4 Ohms
• 1 Ohms

Two identical resistors connected in parallel have an equivalent resistance of 40 ohms. What is the resistance of each resistor? 

• 40. Ohm
• 160 Ohm
• 80. Ohm
• 20. Ohm

At which positition should an ammeter be placed to measure the current passing only through R1?

• 1
• 2
• 3
• 4

A 9.0 V battery is connected to a 4.0 Ohm resistor and a 5.0 Ohm resistor. What is the current in the 5.0 ohm resistor? 

• 4.0 A
• 1.0 A
• 2.3 A
• 1.8 A 

In which current would ammeter A show the greatest current? 

• 1
• 2
• 3
• 4

If switch S1 in the given diagram is open, the reading of Ammeter A is 

• 2.0 A
• 1.5 A
• 6.0 A
• 0.50 A

A physics student is given three 12-ohm resistors with instructions to create the circuit that would have the lowest possible resistance. The correct circuit would be a 

• parallel circuit with an equivalent resistance of 4.0 ohms
• series circuit with an equivalent resistance of 4.0 ohms
• parallel circuit with an equivalent resistance of 36 ohms
• series circuit with an equivalent resistance of 36 ohms 

The equivalent resistance in this part of the circuit is equal to 

• 19 Ohms
• 0.67 Ohms
• 1.5 Ohms
• 6.3 Ohms