Question

1) what does an electric circuit mean ? 2) Define the unit of current ? 3) Calculate the number of electrons constituting one coulomb of charge ?

Answer 1

1. It is a continuous and closed path made of conducting wire, through which the electric current flows. it consist of a cell,ammeter,voltmeter, switch etc

2. SI unit of current is Ampere (A)

When 1 coulomb of charge flows through a wire in 1 second then it is said to be 1 Ampere

1A = 1C/1s

3. Given that

Charge (Q) = 1 C

Electron (e) = 1.6× 10^-19

Number of electron (n) = ?

Q= ne

1 C = n × 1.6×10^-19 C

n = 1/(1.6×10^-19)

n = 6.25 × 10^18 electron

Answer 2

1. What does an electric circuit mean?

Answer :$A \:\:closed\:\: and\:\:continuous\:\: path \:\: of\:\: an\:\: electric\:\:current.$

2. Define the unit of current.

Answer :

The unit of current is Ampere (A).

3. Calculate the number of electrons constituting one coulomb of charge.

Answer :

We know that,

on one electron = 1.6 × 10⁻¹⁹ C

⇒ 1.6 × 10⁻¹⁹ Coulomb

∴ 1 coulomb charge = $\bf \frac{1}{1.6\times {10}^{-19}}$ ≈ 6 × 10¹⁸ electrons

Meaning of -

electric current : $The \:\: amount \:\:of\:\: charge\:\: flowing\:\: through\:\: a \:\:particular\:\: area\:\: in\:\: unit\:\: time.$