Question

plzz give full solutions of this questions.
I need it plzzz very important .----
____________________

1). if a potential difference of 10 V causes a current of 2 A to flow for 1 minute , how much energy is transferred ?

2 ). How many electrons are flowing per second past a point in a circuit in which there is a current of 5 amp ?

Answer 1

hello dear sister......!!!

• Question ( 1 ) :

According to the question it is given that,

• current ( I ) = 2A

• potential difference ( V ) = 10 V

• time ( t ) = 1 min = 60 seconds

we should calculate the amount of energy transferred

we know,

Q = I x T

implies, Q = 2 x 60 = 120 C

V = W / Q
( here W represent energy or work done )

therefore,

W = V x Q

W = 10 x 120

W = 1200J = 1.2 KJ

Question ( 2 ) :

According to the question, it is given that,

• current ( I ) = 5 ampere

• Time ( T ) = 1 second

we should calculate the number of electrons that flow per second

we know that,

I = Q / T

implies, Q = I x T

therefore, Q = 5 x 1 = 5 c

to calculate no. of electrons we know,

Q = n x e

here ' n ' represent no. of electrons and ' e ' represents charge of an electron.

therefore,

n = Q / e

$n \: \: = \: \frac{5}{1.6 \times {10}^{ - 19} }$


therefore,

$n \: \: = 3.125 \times {10}^{19}$
therefore,

$n \: \: = 3125 \times {10}^{16}$

$3125 \times {10}^{16}$
is the number of electrons that flow per second in the circuit.

_________________________________

Hope it helps....!!!