Question

a source emf of 5v supplies a current of 3A for 10 minutes. how much energy provided in this time​

Answer 1

• emf, V = 5 volt

• Current, I = 3 A

• Time, t = 10 minutes

$1 \: minute \: = 60 \: seconds \\ \\ 10\: minutes \: = 10 \times 60 \: seconds \\ \\t = 600 \: seconds$

We know that,

Power, P = VI

P = 5 × 3

P = 15 watt

Power consumed is 15 watt.

We know that,

Power is defined as the rate of doing work.

Power = Work done / Time

Here work is referred to as the energy provided.

P = Energy / Time

$15 = \frac{E}{600} \\ \\ E = 15 \times 600 \\ \\ E = 9000 \: joules \\ \\ E = 9 \times 1000 \: joules \\ \\ = 9 \times {10}^{3} J \\ \\ E = 9KJ$

The energy provided in the given time is 9 KJ or 9000 J.

Answer 2

Answer:

$\huge \frak{ { \{Given \}}}$

• Emf = 5 V
• Current = 3 A
• Time taken = 10 min = 600 sec

$\huge \frak{ \{To \: Find \}}$

Energy

$\huge \frak{ \{ Solution \}}$

As we know that

$\star \frak\red{P = VI}$

$\tt \: P =(5)(3)$

$\frak \red{P = 15 \: w}$

$\frak \blue{P = \dfrac{E}T}$

$\tt \: 15 = \dfrac{ E}{600}$

$\tt \: E = 600 \times 15$

$\frak \pink{ E = 900 \: j}$

Hence :-

Energy is 900 Joule