FROM OHM' S LAW WRITE A BRIEF NOTE ON ELECTRICAL ENERGY AND POWER DESIPATED[ EXPRESSIONS FOR POWER ] IN AN ELECTRIC CIRCUIT

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Solution

$f r o m o h m' s l a w w e g e t V = I R P o w e r d i s s i p a t i v e i s g i v e n b y : P = V I P = (I R) R P = I^{2} R f r o m t h e a b o v e e x p r e s s i o n w e c a n s e e t h a t, p o w e r d i s s i p a t e d a c r o s s t h e a n y e l e c t r i c c i r c u i t i s d i r e c t l y p r o p o r t i o n a l t o t h e r e s i s \tan c e o f t h e c i r c u i t . T h i s f o r m u l a i s a p p l i c a b l e w h e n e l e m e n t s a r e c o n n e c t e d i n s e r i e s . W h e n a n d P = V (\frac{V}{R}) P = \frac{V^{2}}{R} T h i s f o r m u l a i s a p p l i c a b l e w h e n e l e m e n t s a r e c o n n e c t e d i n p a r a l l e l . e n e r g y i s g i v e n b y : E = p o w e r \times t i m e E = I^{2} R t T h i s f o r m u l a i s a p p l i c a b l e w h e n e l e m e n t s a r e c o n n e c t e d i n s e r i e s . E = \frac{V^{2} t}{R} T h i s f o r m u l a i s a p p l i c a b l e w h e n e l e m e n t s a r e c o n n e c t e d i n p a r a l l e l .$

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Which of the following represents electrical power dissipated in an electrical circuit?

A source of potential difference V volt sends current I ampere in a circuit for time t second. Write expressions for

(a) electrical energy supplied by the source, and

(b) electrical power spent by the source.

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