add it up
Learn about series circuits and voltage dividers
- Voltage Divider
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.
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.