Back EMF

The counter-electromotive force (abbreviated counter emf, or CEMF ) 1 is the voltage, or electromotive force, that pushes against the current which induces it, is caused by a changing electromagnetic field. It's represented by Lenz's Law of electromagnetism. Back electromotive force is a voltage that occurs in electric motors where there is relative motion between the armature of the motor and the external magnetic field. Counter emf is a voltage developed in an inductor network by a pulsating current or an alternating current. 2 The voltage's polarity is at every moment the reverse of the input voltage 3 4

In a generator using a rotating armature and, in the presence of a magnetic flux, the conductors cut the magnetic field lines as they rotate. The changing field strength produces a voltage in the coil; the motor is acting like a generator.. (Faraday's law of induction.) This voltage opposes the original applied voltage; therefore, it is called "counter-electromotive force". (by Lenz's law.) With a lower overall voltage across the armature, the current flowing into the motor coils is reduced. 5

Pretty self explanatory dont you think, i added this as the previous entry was rubbish and he's obviously visited an engineer who doesn't know what back EMF is.

by Nicker doodle doo May 29, 2007

Backdoor Boogie

To sneak off home without prior warning. ie. out the backdoor without telling people you're going. used in Whitehaven and surrounding areas.

Jolo- 'where did Richie ga last night Ang?'
Angie D- 'Dunno, he musta done a Backdoor Boogie'

by Jolo/Andrea November 14, 2009

Bitch Back

Reclaiming your crown.

Speaking your truth and owning it.

Being confident and holding your boundaries.

Got your groove back.
Stepping into your power.
Bad Ass!
OWN IT

"No one's messing with you, you spoke your truth you got your Bitch Back."
"Girl fuck that, get your Bitch Back."

by JMC85 October 15, 2019

Blow your back out

To fuck someone so good, they can't walk for a couple of days. Hence their back is blown out.

Boy: Damn, girl, I can blow your back out
Girl: Um, I don't think so, I have a soccer game in the morning and I'd actually like to walk.

by BritneyLee09 February 22, 2009

Back to school

The phrase you dread seeing most in the summer holidays when you go into town for uniform shopping. Why on earth should stores torture you with a reminder that schools just a few weeks away?

I went into Pound Stretcher and saw what i dreaded most, signs saying 'Back to School'.

by sangajin August 15, 2007

bicken back being bool

Bicken Back Being Bool means kicking back being cool... Blood gangs use b's instead of C's or K's because the letter K sounds like a C

I was at this girls house... I didn't do nothing though. Just bicken back being bool

by StreetTerms March 14, 2015

Mississippi Back Wax

The act of sliding down a rocky hill drunk and shirtless removing hair/skin from ones back.

Jimbo must've drank too much, he slipped taking a piss and got a Mississippi Back Wax!

by Spencer Bergstrand August 6, 2008