The HCF of 13.52, 17.68,21.84 and 11.44 is
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Electric current is defined to be the rate at which charge flows. A large current, such as that used to start a truck engine, moves a large amount of charge in a small time, whereas a small current, such as that used to operate a hand-held calculator, moves a small amount of charge over a long period of time. In equation form, electric current I is defined to
where \Delta Q is the amount of charge passing through a given area in time \Delta t. (As in previous chapters, initial time is often taken to be zero, in which case \Delta t=t.) (See [link].) The SI unit for current is the ampere (A), named for the French physicist André-Marie Ampère (1775–1836). Since I=\Delta Q/\Delta t, we see that an ampere is one coulomb per second:
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