Series Resistance Calculations Quiz

Answer explanation

The total resistance of two resistors connected in series is the sum of their individual resistances, so 4 + 6 = 10 Ω.

Answer explanation

The total resistance is the sum of the individual resistances, so 2 + 3 + 5 = 10 Ω.

Imagine you're setting up a string of holiday lights and decide to add another light (which acts as a resistor) to the series. How does this affect the total resistance of the light string?

• It decreases the total resistance.

• It does not change the total resistance.

• It increases the total resistance.

• It halves the total resistance.

Answer explanation

Adding another light (resistor) to the series increases the total resistance, as resistance in a series circuit adds up.

Answer explanation

The total resistance of the circuit is the sum of all the resistances, which is 1 + 2 + 3 + 4 = 10 Ω.

Answer explanation

When resistors are in series, the total resistance is the sum of individual resistances. So, 8 + 12 = 20 Ω.

Answer explanation

In a series circuit, the total resistance is the sum of all individual resistances. So, the third resistor's resistance is 20 - (5 + 10) = 5 Ω.

What happens to the current through the circuit if the total resistance of resistors in series increases?

• The current increases.

• The current decreases.

• The current remains unchanged.

• The current doubles.

Answer explanation

When the total resistance of resistors in series increases, the current through the circuit decreases due to the increased overall resistance.

Answer explanation

The combined resistance of the other resistors is 30 Ω, which can be found by subtracting the given resistor's resistance from the total resistance in the series circuit.

Answer explanation

In a series circuit, the total resistance is the sum of all individual resistances. Therefore, the total resistance is 5 * 4 = 20 Ω.

Answer explanation

The total resistance of three resistors in series is calculated by adding their individual resistances, so the correct answer is R_total = R_1 + R_2 + R_3.