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

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

The combined resistance of two resistors connected in series is 55Ω. One of the resistors is 30Ω.

What is the size of the second resistor?

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

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