Electric Current Through Conductors — Physics STD 11 Science — Question
Maharashtra BoardEnglish MediumSTD 11 SciencePhysicsElectric Current Through Conductors3 Marks
Question
A current of 4 A flows through an automobile headlight. How many electrons flow through the headlight in a time of 2 hrs?
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Answer
Given: $I =4 A , t =2$ hrs $=2 \times 60 \times 60 s$ To find: Number of electrons (N) Formula: $I =\frac{q}{t}=\frac{N e}{t}$ Calculation: As we know, e $=1.6 \times 10^{-19} C$ From formula, $ N =\frac{I t}{e}=\frac{4 \times 2 \times 60 \times 60}{1.6 \times 10^{-19}}=18 \times 10^{-23} $
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