# Can I use my doorbell transformer to measure voltage for real power measurement?

**URL:** <https://community.openenergymonitor.org/t/can-i-use-my-doorbell-transformer-to-measure-voltage-for-real-power-measurement/25336>\
**Category:** Hardware\
**Created:** [14 January 2024 23:41 UTC](https://community.openenergymonitor.org/t/can-i-use-my-doorbell-transformer-to-measure-voltage-for-real-power-measurement/25336 "2024-01-14T23:41:43Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![Bill.Thomson](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/bill.thomson/32/1834_2.png) [@Bill.Thomson](https://community.openenergymonitor.org/u/Bill.Thomson)\
**Post date:** [18 January 2024 14:03 UTC](https://community.openenergymonitor.org/t/can-i-use-my-doorbell-transformer-to-measure-voltage-for-real-power-measurement/25336/8 "2024-01-18T14:03:23Z")

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You may want to have a look at this:

> [@DIY Current Monitor on Raspberry Pi. My power calculation isn't accurate. Help please?](https://community.openenergymonitor.org/t/diy-current-monitor-on-raspberry-pi-my-power-calculation-isnt-accurate-help-please/13266/174):
>
> The two 100 mA c.t’s should read 110 A max, the 50 mA one 104.75 A (both with a little bit to spare). Now you can see where the money goes…

There’s some good info ~~about using the “1015” ADC~~ in that thread.

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