Question

An electric bulb draws a current of 0.2 ampere when the voltage is 220 volts then calculate the amount of electric charge flowing through it in one hour.​

Answer 1

Solution: It is given that an electric bulb draws a current of 0.2 ampere when the voltage is 220 volts.

Here,

Current, I = 0.2 A

Potential difference, V = 220 V

time = 1hr = 60 × 60 = 3600 s

As we know that,

Current, I = Q/t

where,

Q = Charge and t = time taken.

Using,

Current, I = Q/t

So,

Q = It

Q = 0.2 × 3600

Q = 720 C

Therefore, 720 C is the amount of electric charge flowing through it in one hour.

Answer 2

Please note that Potential Difference mentioned here of 220 Volts have no use in taking out amount of charges flowing through the circuit in 1hr.

Since we know that,

I = C/t, where each stands for

• I for electric current,
• C for charge in electrons,
• t refers to time taken.

Coming on to the question

0.2 A = C/1 hr

Where, 1 hr = 60 × 60 s

⇒ 0.2 A × 1 hr = C

⇒ 0.2 × 60 × 60 = C

⇒ 720 C = Charges

Answer : 720 C