# Series Circuit

#### add it up

**Objective **

Learn about series circuits and voltage dividers

**Essential Keywords **

- Voltage
- Current
- Series
- Voltage Divider

#### ATTENTION

We talked about Voltage being like a hill and the Battery puts the ball on top of the hill. We could also compare to items on a shelf. We can have the low shelf and a top shelf and anything in between. If one battery puts the ball on the first shelf, we can add a second battery to put it to the second shelf. A 4 battery pack is like a 4 shelf high system. Adding voltages on top of each other is a **Series Circuit **.

### Voltage Divider Circuit

Resistors can also be arranged in Series. In this case the value of the resistors adds up. So if each resistor is 100k then a series stack of five would be 500k. In a series circuit the current is the same in each resistor so from ohms law

V = I * R

You can see that the voltage is shared or divided among the resistors in the series stack. If they are all equal they will each have an equal voltage.

### Project

First complete the measurements on the 5 equal resistor divider the next 2 steps. Then try different values of resistors to make your own divider. Make a divider circuit that gives us 1/10 of the voltage to provide a 10 x range for voltage measurements.