Sunday, 21 September 2014

CHARGE , CURRENT AND TIME CALCULATIONS






CHARGE



CURRENT


TIME


WORKING OUT

ANSWER
(WITH UNITS)


1


?

4A

30 s



2


?

0.2A

5 min



3


600 C

?

300 s



4


10,000 C

3.5A

?



5


0.5 C

5A

?



6


?

300 mA

10 s



7


300 mC

?

5 s



8.         A student is performing an experiment to measure the charge stored by a
capacitor. When he discharges it he finds the average current is 200 mA
and that it takes 40 s to discharge.  What was the charge on the
capacitor?




9.         The dome of a Van de-Graaf generator holds a charge of 100 mC.  When
            a man touches the dome it discharges in 3 x 10 -2 s.  What is the current
            that flows through the man to earth?





10.       In an electroplating experiment a student connects up a circuit that
            delivers a steady current of 0.2 A. If it requires 96500 C of charge to
            deposit 64 g of copper, how long will it take to deposit 20 g?