Learn how to calculate resistance in series and parallel circuits.

Two bulbs are connected in a series circuit. One bulb is unscrewed, what happens to the other bulb?

It gets dimmer

It does not light

It gets brighter

Two resistors are connected in series to a 12 V power supply. The voltage across one of the resistors is 10 V. What is the voltage across the second resistor?

2 V

10 V

12 V

What is the combined resistance of a 2 Ω and a 3 Ω resistor connected in series?

6 Ω

5 Ω

1 Ω

The combined resistance of two resistors connected in series is 55 Ω. One of the series resistors is 30 Ω. What is the size of the second resistor?

15 Ω

25 Ω

85 Ω

Two bulbs are connected in a parallel circuit. One bulb is unscrewed, what happens to the other bulb?

Its brightness does not change

A parallel circuit has two identical resistors. A current of 4 A flows from the battery. What is the value of the current through each resistor?

1 A

2 A

4 A

A series circuit has two identical resistors. A current of 4 A flows from the battery. What is the value of the current through each resistor?

Two 15 Ω resistors are connected in parallel. What is the total resistance?

7.5 Ω

30 Ω

Two resistors are connected in parallel. The voltage across one of the resistors is 12 V. What is the voltage across the second resistor?

Two 8 Ω resistors are connected in parallel. The parallel combination is then connected in series with a 10 Ω resistor. What is the total resistance?

12 Ω

14 Ω

26 Ω