8873Views5Replies

Author Options:

What Ohm resistor do i need to turn 9volts into 5volts? Answered

Discussions

The forums are retiring in 2021 and are now closed for new topics and comments.
0
rocketman221
rocketman221

11 years ago

resistors limit current not voltage. you can use my electrical calculator to figure it out though. if you need a constant voltage you will need a voltage regulator.

0
collard41
collard41

11 years ago

You would actually need two resistors to do that, basically a resistance of around 100Ohms for the to and about 130Ohms for the bottom one. the picture shows this

Potential divider.jpg
0
collard41
collard41

Answer 11 years ago

if there is a lot of current involved in your circuit or if it is running on batteries then you will want higher values. multiples of these values will give you the same voltage (eg. 100:130 => 500:650 x5)

0
CameronSS
CameronSS

11 years ago

If you want a constant 5V output from a 9V battery, you can use a 7805 voltage regulator. There are multiple Instructables on how to use them, such as this or this. Basically, you connect your ground for both the 5V side and the 9V side to the center pin, and connect +9V to the side pin. The other side will put out +5V.

0
jj37
jj37

11 years ago

how many amps is the said 9 volts?