Question

Безопасной для человека считается сила тока 1мА. Какой заряд проходит по цепи за 10 секунд при такой силе тока?Сколько электронов должно проходить через поперечное сечение проводника за 1 секунду, чтобы создать такую силу тока?

Answer 1

Q=I*t=0,001*10=0,01 Кл
n=q/e=0,01/1,6*10^-19=625*10^14

Answer 2

Calculation of Charge and Number of Electrons

To calculate the charge that passes through a circuit in 10 seconds with a current of 1 mA, we can use the formula:

Charge (Q) = Current (I) x Time (t)

Given that the current is 1 mA and the time is 10 seconds, we can substitute these values into the formula:

Q = 1 mA x 10 s

To calculate the number of electrons that pass through a conductor in 1 second to create such a current, we need to know the charge of a single electron. The elementary charge is approximately 1.6 x 10^-19 coulombs.

To find the number of electrons, we can use the formula:

Number of electrons = Charge (Q) / Elementary charge

Given that the charge is 1 mA x 10 s and the elementary charge is 1.6 x 10^-19 coulombs, we can substitute these values into the formula:

Number of electrons = (1 mA x 10 s) / (1.6 x 10^-19 C)

Let's calculate the values:

Charge (Q) = 1 mA x 10 s = 10 mA s

Number of electrons = (10 mA s) / (1.6 x 10^-19 C)

To calculate the number of electrons, we need to convert milliamperes (mA) to amperes (A) and seconds (s) to coulombs (C):

1 mA = 0.001 A

1 s = 1 C

Substituting these values into the equation:

Number of electrons = (10 mA x 0.001 A x 10 s) / (1.6 x 10^-19 C)

Simplifying the equation:

Number of electrons = (0.1 A s) / (1.6 x 10^-19 C)

Now we can calculate the number of electrons:

Number of electrons = (0.1 A s) / (1.6 x 10^-19 C) = 6.25 x 10^17 electrons

Therefore, to create a current of 1 mA, approximately 6.25 x 10^17 electrons need to pass through the cross-sectional area of the conductor in 1 second.

Please note that the above calculations are based on the given information and assumptions about the elementary charge and the units used.