PB1.Q8.iii

What is the equivalent resistance of the series combination of the 5Ω and 3Ω resistors?

• 2 Ω

• 8 Ω

• 15 Ω

• 2.5 Ω

When resistors are connected in parallel, how does the equivalent resistance compare to the individual resistances?

• It is always greater than the largest individual resistance.

• It is always equal to the sum of the individual resistances.

• It is always smaller than the smallest individual resistance.

• It is the average of the individual resistances.

What is the equivalent resistance of the parallel combination of the 2Ω resistor and the 8Ω series combination (calculated in question 1)?

• 10 Ω

• 1.6 Ω

• 6 Ω

• 0.625 Ω

What is the total resistance of the entire circuit when the key K is closed (including the internal resistance of the battery)?

• 1.6 Ω

• 2 Ω

• 8.4 Ω

• 10.4 Ω

When the key K is closed, what is the total current flowing through the circuit from the battery?

• 0.4 A

• 2 A

• 2.5 A

• 10 A

When the key K is closed, the voltage drop across the parallel combination of resistors is:

• 4 V

• 3.2 V

• 0.8 V

• 0 V

What is the current flowing through the 3Ω resistor when the key K is closed?

• 0.4 A

• 0.5 A

• 1.0 A

• 2.67 A

Which of the following formulas is used to calculate the equivalent resistance (R) of two resistors R1 and R2 connected in parallel?

• R = R1 + R2

• R = (R1 x R2) / (R1 + R2)

• R = (R1 + R2) / (R1 x R2)

• R = 1 / (R1 + R2)

If the 5 ohm resistor is removed from the circuit, then the current flowing through the 3 ohm resistor will:

• Increase

• Decrease

• Remain the same

• Become zero