Understanding Resistors in Circuits

What is the total resistance of two 10 ohm resistors in series?

• 20 ohms

• 10 ohms

• 5 ohms

• 30 ohms

How do you calculate the equivalent resistance of resistors in parallel?

• R_eq = R1 + R2 + ... + Rn

• R_eq = R1 * R2 / (R1 + R2)

• R_eq = R1 - R2

• R_eq = 1 / (1/R1 + 1/R2 + ... + 1/Rn)

If one resistor in a parallel circuit fails, what happens to the total resistance?

• The total resistance decreases.

• The circuit becomes open.

• The total resistance remains the same.

• The total resistance increases.

What is the formula for total resistance in a series circuit?

• R_total = R1 + R2 + R3 + ... + Rn

• R_total = R1 * R2 * R3 * ... * Rn

• R_total = 1/(1/R1 + 1/R2 + 1/R3 + ... + 1/Rn)

• R_total = R1 - R2 - R3 - ... - Rn

In a parallel circuit, how does the voltage across each resistor compare?

• The voltage across each resistor is different.

• The voltage is zero across all resistors.

• The voltage varies depending on the current through each resistor.

• The voltage across each resistor is the same.

What happens to the current in a series circuit if one resistor is removed?

• The current increases significantly.

• The current stops flowing.

• The current flows in the opposite direction.

• The current remains the same.

How do you find the total current in a parallel circuit with three resistors?

• Total current = I1 / I2 + I3

• Total current = I1 + I2 - I3

• Total current = I1 * I2 * I3

• Total current = I1 + I2 + I3, where I1, I2, and I3 are the currents through each resistor.

What is the effect of adding more resistors in series on the total resistance?

• The total resistance fluctuates.

• The total resistance remains the same.

• The total resistance decreases.

• The total resistance increases.

If two resistors of 20 ohms and 30 ohms are in parallel, what is the equivalent resistance?

• 25 ohms

• 10 ohms

• 15 ohms

• 12 ohms

Why is it important to understand the difference between series and parallel circuits?

• It is important to understand the difference to ensure proper design, reliability, and troubleshooting of electrical systems.

• Series circuits are always more efficient than parallel circuits.

• Understanding circuit types is irrelevant for basic electrical safety.

• Parallel circuits can only be used in low-voltage applications.