An Electric Motors Uses MORE Current When Stopped. Here’s the Physics.

Rhett Allain
6 min readDec 12, 2023
Photo: Rhett Allain. DC Electric Motors.

Here’s a fun question. Imagine I have a small DC fan that’s on and spinning. I can measure the electric current going into the motor. Let’s say I get a value of 0.6 amps. Now, if I stop that fan motor the electric current will increase to something like 1.0 amps. Here’s a quick experiment to show that.

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Rhett Allain

Physics faculty, science blogger of all things geek. Technical Consultant for CBS MacGyver and MythBusters. WIRED blogger.