Basic Engineering Mathematics, Fifth Edition

(Amelia) #1

128 Basic Engineering Mathematics



  1. The current i flowing in a capacitor at
    time t is given byi= 12. 5 ( 1 −e−t/CR),
    where resistance R is 30k and the
    capacitance C is 20μF. Determine (a)
    the current flowing after 0.5seconds and
    (b) the time for the current to reach
    10amperes.
    10. The amountAafternyears of a sum invested
    P is given by the compound interest law
    A=Pern/^100 , when the per unit interest rate
    ris added continuously. Determine, correct
    to the nearest pound, the amount after 8 years
    for a sum of £1500 invested if the interest
    rate is 6% per annum.

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