## Series and parallel circuits

### 1

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

### 2

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?

### 3

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

### 4

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?

### 5

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

### 6

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?

### 7

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?

### 8

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

### 9

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

### 10

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?