in current electricity and electrostatic chapters we had learned that potential difference across 2 point AB =potential difference across AC+potential difference across CB but in alternating current chapter we don't do so we use Pythagoras theorem why so

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$P o t e n t i a l d r o p i n c a s e o f a l t e r n a t i n g c u r r e n t a c r o s s a c e r t a i n s e g m e n t s a y A B C i s t h e s u m o f p o \tan t i a l d r o p a c r o s s t h e s e g m e n t A B a n d a c r o s s t h e s e g m e n t B C h o l d s b u t v o l t a g e s h o u l d b e w r i t t e n i n t i m e d o m a i n t h a t i s i n t e r m s o f t i m e a n d w e u s e p h a s o r d i a g r a m t o s o l v e f o r t h e c i r c u i t i n w h i c h w e a r e r e q u i e d t o c a l c u l a t e t h e r m s v a l u e o r t h e p e a k v a l u e . R e g a r d s$

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