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Cathode

By Sweetwater on August 18, 2000

The terminal on an electrical device from which a major flow of electrons takes place (as in a vacuum tube) or from which electric current flows (as in a battery). The converse of anode. The term is also sometimes used to refer to the negative side of a solid state diode. In tubes the cathode is the source of a cathode-ray, or a cloud of electrons that moves towards the oppositely changed anode. A cathode-ray tube (CRT) is a special case where this is used to generate a picture on a phosphorous screen.

Offer applies only to single-receipt qualifying purchases. No interest will be charged on the promo balance if you pay it off, in full, within the promo period. If you do not, interest will be charged on the promo balance from the purchase date. The required minimum monthly payments may or may not pay off the promo balance before the end of the promo period, depending on purchase amount, promo length and payment allocation. Regular account terms apply to non-promo purchases and, after promo period ends, to the promo balance. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

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Cathode

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Cathode

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