Question

Relation between electric current and drift velocity :derivation of ohm's law

Answer 1

Explanation:

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 be

I=\frac{\Delta Q}{\Delta t}\text{,}

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:

Not only are fuses and circuit breakers rated in amperes (or amps), so are many electrical appliances.

The rate of flow of charge is current. An ampere is the flow of one coulomb through an area in one second.

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