Question

A torch bulb of 3v draws current of 0.4 A . if the bulb is switched on for five minutes, calculate the energy drawn by the bulb.​

Answer 1

Question

A torch bulb of 3v draws current of 0.4 A . if the bulb is switched on for five minutes, calculate the energy drawn by the bulb.

Answer;

Given,

potential difference(v)= 3v

Current(I) = 0. 4

Time (t)= 5min = 5 seconds

Here,

Energy drawn by the bulb = I * V * t

= 0. 4 × 3 × 300

= 360 J

Additional information

When an electric current is passed through the conductor, it generates heat due to the hindrance cause by conductor to the flow of current which is known as heating effect of electric curren

Character

• They have good electric resistant
• They do not melt up until 1500°C
• They do not get oxidize in air up to 1000°C

Answer 2

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Q) A torch of 3V draws current of 0.4 A . If the bulb is switched on for 5 minutes , Calculate the Energy drawn by the bulb .

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☆ Given :

• V = 3v
• Current (I) = 0.4 A
• Time (t) = 5 minutes

☆ To Find :

• Energy (E) = ?

☆ Solution :

• Time = 5 minutes .

• Change Minutes into Seconds

• Time = 5 × 60 s = 300 s

Now ,

As we know ,

${\boxed{\sf{Energy=Power×Time}}}$

And ,

${\boxed{\sf{Power=VI}}}$

so ,

$\underline{\underline{ \rm \: energy = v \times i \times t \: \: }}$

$\mapsto \rm \: energy = 3 \times 0.4 \times 300 \: joules$

$\mapsto \pink{\boxed{ \rm \: energy = 360 \: joules \: }}$

So ,

The Energy drawn by the bulb would be 360 joules .

_________________________

☆ Know More :

• 1 watt Power : It's consumed when 1 Ampere of current flows through a device at potential difference = 1 V .

• Electrical Energy : Work done to maintain current in an electric circuit .

• Some Formulas :

1. q = It
2. W = Vq
3. E = VIt
4. P = W/t
5. P = VI
6. V = IR