if there are n particles per unit volume each having charge q and moving with speed v then current through cross sectional area A is
Answers
Answer: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
=
Δ
Q
Δ
t
,
where ΔQ is the amount of charge passing through a given area in time Δt. (As in previous chapters, initial time is often taken to be zero, in which case Δt = t.) (See Figure 1.) The SI unit for current is the ampere (A), named for the French physicist André-Marie Ampère (1775–1836). Since I = ΔQ/Δt, we see that an ampere is one coulomb per second:
1 A = 1 C/s
Not only are fuses and circuit breakers rated in amperes (or amps), so are many electrical appliances.
Explanation:
V×A×N×q =I
Where v=velocity
A=area
N=no.of free electron per unit volume
q=1.6×10^-19
I= current