Compute the no. Of electrons passing …

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Compute the no. Of electrons passing per minute through an electric bulb of 60w,220v

Posted by Plaksha Jain 4 years, 5 months ago

CBSE > Class 10 > Science

1 answers

Unnati Sharma 4 years, 5 months ago

Given :- Power (P) = 60 W Voltage (V) = 220 V Time (T) = 1 min = 60 Sec Charge of an electron (q) = 1.6 × 10⁻¹⁹ C To Calculate :- Numbers of electron (n) = ??? Formula to be used :- = I × T/Q ..... Eq (i) Solution :- Since in this equation/case we do not know the value of I, therefore our prime aim is to find the value of I using the formula, ⇒ I = P/V ⇒ I = 60/220 ⇒ I = 3/11 A Substituting this value of I and the value of t and in eq (i), we get ⇒ n = 3/11 × 60/1.6 × 10⁻¹⁹ ⇒ n = 180 × 10¹⁹/11 × 1.6 ⇒ n = 1.02 × 10²⁰ Electrons. Hence , the Numbers of electron (n) is 1.02 × 10²⁰ Electrons.

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