Combined Electric Circuit

Total resistance in a series circuit

• R_{t =} R₁ + R₂ + R₃ ...
• 1/R_{t =} 1/R₁ + 1/R_{2 ...}
• R_t = R₁ X R₂ / R₁ + R_{2 ...}
• R_t = R_N / R_V 

What kind of circuit is this?

• series
• parallel

Which of the following is the symbol for current?

• A
• V
• Ω
• I

What is the total resistance in this circuit?

• 18000 ohms
• 1800 ohms
• 180 ohms
• none of the others

What is the total resistance in this circuit?

• 625 kΩ
• .625 mΩ
• 625 Ω
• 6.25 kΩ

What is the total resistance of this circuit?

• 0 Ω
• -1 Ω
• 25 Ω
• 1 Ω

What must be inserted between points A and B to establish a steady electric current in the incomplete circuit represented in the diagram below?

• magnetic field source
• switch
• source of potential difference
• voltmeter

Two resistors are connected to a source of voltage as shown in the diagram below. At which position should an ammeter be placed to measure the current passing only through resistor R1?

• 1
• 2
• 3
• 4

A 9.0-volt battery is connected to a 4.0-ohm resistor and a 5.0-ohm resistor as shown in the diagram below. What is the current?

• 1.0 Amps
• 1.3 Amps
• 1.8 Amps
• 9 Amps

A complete circuit is left on for several minutes, causing the connecting copper wire to become hot. As the temperature of the wire increases, the electrical resistance of the wire

• increases
• decreases
• remains the same