Question

A current on 0.8A is drawn by a filament of an electric bulb for 15 minutes Find the amount of electric charge that flows through the circuit

Answer 1

Given:- current (I)= 0.8 A , Time (t)= 15min

To find:- The amount of electric charge that flows through the circuit.

Solⁿ:- Firstly change 15min into sec →15min = 15×60= 900sec

Let us assume the amount of electric charge flowing through the circuit as 'Q'.

We know that,

$i = \frac{q}{t}$

where i stands for the current, q stands for the amount of electric charge flowing and t stands for time.

$q = i \times t$

$q = 0.8 \times 900 \: c$

$q = 720c$

Therefore, the amount of electric charge flowing through the circuit is 720C.

Answer 2

Given

➲ Current flowing (I) = 0.8 A

➲ Time taken (t) = 15 minutes.

To find

➲ Amount of electric charge flowing through circuit

Solution

From the given question we have ;

⇒ Current (I) = 0.8 A

⇒ Time (t) = 15 minutes

= (15 × 60) s

= 900 s

⇒ Charge flowing (Q) = ?

We will use the formula for finding electric current in a circuit , that is :

⇒ Current (I) = Charge(Q)/Time(t)

Substituting values,

⇒ 0.8 = Q/900

⇒ Q = 0.8 × 900

⇒ Q = 720

⇒ Q = 720 Coloumbs.

∴ Amount of electric charge flowing through circuit = 720 c [Answer]

Some more formulas :

➲ I = V/R (Ohm's law)

Where

• I = Current
• V = Potential difference
• R = Resistance

➲ V = W/Q

Where

• V = Potential difference
• W = Work done
• Q = Charge flowing