Question

Find the amount of electric charge that flows through the circuit when a
current of 0.25 A is drawn by an electric bulb for 2 minutes.
​

Answer 1

Answer:Solution:

GIVEN:

Current (I)= 0.25 A

Time(t)= 20 min

t= 20 × 60= 1200 seconds

[1 minute= 60 seconds]

We know that,

I = Q/t

0.25 = Q/1200

Q= 0.25 × 1200

Q= 300 C

Hence, the amount of electric charge that flows through the circuit is 300 coulombs.

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Answer 2

S O L U T I O N :

$\underline{\bf{Given\::}}$

• Current, (i) = 0.25 Ampere
• Time, (t) = 2 minutes

$\underline{\bf{Explanation\::}}$

As we know that formula of the current;

$\boxed{\bf{Current\:,(i) = \frac{q}{t} }}$

→ Time = 2 minutes

→ Time = 2 × 60  [1 min. = 60 seconds]

→ Time = 120 seconds

Now,

As we know that formula of the electric charge;

$\boxed{\bf{Electric\:charge\:,(q) = i \times t }}$

$\mapsto\tt{Electric\:charge = i \times t}$

$\mapsto\tt{Electric\:charge = 0.25 \times 120}$

$\mapsto\bf{Electric\:charge = 30\:C}$

Thus,

The amount of electric charge will be 30 Coulomb .

Note :

The unit of electric current is ampere or coulomb/sec.