Save
Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't know
Remaining cards (0)
Know
0:00
share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Ch.4

Electromagnetism

QuestionAnswer
Changes in direction, establishes and collapses in the magnetic field AC current
devices used for changing the potential of alternating currents involving two coils primary and secondary Transformers
voltage from the first primary coil is increased to the secondary coil step-up transformer
voltage from primary coil is decreased to the secondary coil step-down transformer
Calculates the voltage and the number of turns in the secondary and primary coils Transformer Law: Vs/Vp = Ns/Np
Calculates current AMPERAGE (I) in combination with the transformer law Ohm's Law Is/Ip =Vp/Vs
Amps _______ as voltage _______ in step-up decrease, increases
Caused by highly induced voltages and massive amounts wires in step-up transformers power loss
copper loss, resistant to current flow I2R loss
lag loss due to fluctuating AC current Hysteresis
current opposition to its original Eddy current
Name four core configurations Air,Open,Closed,Shell-Type
Which core configurations most commonly used in cray generators? Shell-Type
Primary/Secondary coils are connected in series rather than insulation in this type of transformer autotransformer
Three major transformers in an x-ray circuit Autotransformer, High-voltage step-up transformer, Filament Step-down transformer
decreases incoming line voltage to heat the tube filament Filament Step-down transformer
this type of transformer raises incoming line voltage needed for xray production High-voltage step-up transformer
varies incoming line voltage Autotransformer
Device capable of accumulating and storing electrical charge, and commonly used in portables capacitors
Uses only half of incoming alternating current to be converted to pulsating direct current half-wave rectification
Use of four rectifiers(4 diodes) in the secondary coil of step-up transformer full-wave rectification
Converts negative part of AC sine wave to positive current, flowing in one direction full wave rectification
Created by: nwfsc
 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards