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Calculate the electric current through a...

Calculate the electric current through a wire if 10 coulombs of charge flow through a cross section of the wire in 2 seconds.

Text Solution

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Given charge, `q = 10 C`
Time `t = 2s`
`:. ` The electric current, `i = q/t = (10 C)/(2s) = 5 A`
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(a) Define electric current. What is the SI unit of electric current. (b) One coulomb of charge flows through any cross-section of a conductor in 1 second. What is the current flowing through the conductor? (c) Which instrument is used to measure electric current? How should it be connected in a circuit? (d) What is the conventional direction of the flow of electric current? How does it differ from the direction of flow of electrons? (e) A flash of lightning carries 10C of charge which flows for 0.01s. what is the current? If the voltage is 10MV, what is the energy?

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Knowledge Check

  • If one ampere current flows through a conductor, the number of electrons flowing across the cross section of the conductor in 2 second it "_________" .

    A
    `1.6 xx 10^(-19)`
    B
    `1.25 xx 10^(19)`
    C
    `6.25 xx 10^(8)`
    D
    `3.2 xx 10^(18)`

  • The number of electrons passing per second through a cross section of Cu wire carrying 10 ampere is

    A
    `6 xx 10^(19)`
    B
    `8 xx 10^(19)`
    C
    ` 1 xx 10^(19)`
    D
    `1.6 xx 10^(19)`

  • The current flowing through wire depends on time as, 1 = 3t^(2) + 2t + 5 The charge flowing through the cross - section of the wire in time t = 0 to t = 2 second is

    A
    `22 C`
    B
    `20 C`
    C
    `18 C`
    D
    `5 C`

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    Calculate the amount of current passing through a wire at t=9 s, if the electric charge passing through a cross section of wire in t time is given as q(t)=7t^2+9t-2 .

    Calculate the current in a wire if 900 C of charge passes through it in 10 minutes.

    Calculate the current in a wire if 1500 C charge is passed through it in 5 minutes.

    A wire carries a constant current of 10A. How many coulombs and how many charge carriers pass a cross-rection of the wire in 20 seconds? (charge of electron = 1.6 xx 10^(-19) C

    (a) Deduce the relation between current I flowing through a conductor and drift velocity vecv_d of the electrons. (b) Figure shows a plot of current I flowing through the cross section of a wire versus the time t. Use the plot to find the charge flowing in 10 s through the wire.

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