Combination of Resistances

If current flowing through a bulb is increased then what happens to the resistance?

• increases

• decreases

• does not change

Bulbs in series combination

• glow brightly

• does not glow

• glow dimly

In series combination of resistances, what is common across all resistances?

• voltage

• power

• current

• all of these

If R₁, R₂ and R₃ are 3 resistances connected in series then the equivalent resistance is:

• R₁ + R₂ + R₃

• 1/R₁ + 1/R₂ + 1/R₃

• 1/R₁ + 1/R₂ + R₃

• R₁ + R₂ + 1/R₃

In a parallel combination, what is common to all the resistors?

• current

• power

• voltage

• resistance

If R₁, R₂ and R₃ are 3 resistances connected in parallel then the equivalent resistance is:

• R₁ + R₂ + R₃

• 1/R₁ + 1/R₂ + 1/R₃

• 1/R₁ + 1/R₂ + R₃

• R₁ + R₂ + 1/R₃

What is the total resistance of the three resistors in series with values of 2 ohms, 8 ohms, and 14 ohms?

• 1.44 ohms

• 24 ohms

• 22 ohms

• 20 ohms

A circuit has five resistors in parallel (5,10,20,50, and 100 ohms). The overall resistance is:

• less than 5 ohm

• between 5 to 10 ohms

• 50 ohm

• more than 100 ohms

What is the total resistance of the circuit in the figure?

• 19 ohms

• 29 ohms

• 30 ohms

• 50 ohms

ABCD is a square have a resistance of 1 ohms on each side of the square? What is effective resistance between A and B?

• 1 ohm
• 2 ohms
• 0.5 ohms

• 0.75 ohms