Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Determining Work Load

Status
Not open for further replies.

MattSA

New Member
Can someone tell me if there is a multimeter test that can determine the work load in mAh for a device? I'm working on replacing battery packs in a cordless vacuum, and would like to calculate running time for the new batteries, but do not know how many mAh the vacuum uses.

Thanks,
MattSA
 
mAh is the product of mA and h (hours). Put your multimeter in Adc mode (might mean moving the test leads into different jacks). Connect the meter in-series between the postive pole of the battery (red lead to +) and the motor wire that normally connects to the + pole through the switch. The motor should run. Measure the running current. I'm guessing 1 to 2A.

Say you read 1.5A. That is 1500mA. If your battery stores 3000mAh (3Ah), you could expect the motor to run for 3000mAh/1500mA = 2h.
 
Status
Not open for further replies.

Latest threads

New Articles From Microcontroller Tips

Back
Top