All the hand rules for motors and generators (1 Viewer)

[DragonSoda]

There's some hand rules that are often used wrong, or used for the same purpose and students including myself get confused.
Can somebody please help list as many hand rules as they know?

>Name the Hand Rule
>Briefly what it is used for
>Describe how it's used

Thanks so much!

 

[Hypem]

Right-Hand Grip/Screw Rule

- Solenoids (thumb points to the north pole of the solenoid), to find current direction. If your fingers are facing you, the current will be down on the solenoid. If they aren't, the current will be up.
- Finding direction of magnetic field around a current carrying conductor (thumb current direction, magnetic field direction fingers).
- Finding the way current will swirl in a flat sheet or hoop of conducting material in relation to Lenz's Law (thumb is magnetic field, fingers are current; magnetic field into the page and if B-field decreasing then clockwise. Increasing then anticlockwise. Test this yourself). Still confused (like I was), then watch this: http://www.youtube.com/watch?v=he3ByTc2OQo

Right-Hand Push/Palm Rule

- Finding force/current/magnetic field of a moving conductor in a magnetic field.
- Motor effect. Fingers magnetic field lines direction, thumb current, out of palm in the z-direction is force.

Can't really think of anything else right now.