Question

A battery charger can produce 3A at 12 Volt and charges a battery fer 2 hr. Calculate work in KJ.

Answer 1

The work done by the battery charger is 259.2 kilojoules.

Step-by-step explanation:

To calculate the work done by the battery charger, we can use the formula:

Work (W) = Power (P) x Time (t)

In this case, the power is given as 3A (current) and 12 Volts (voltage), and the time is given as 2 hours. We need to convert the time to seconds:

2 hours = 2 x 60 x 60 = 7200 seconds

Now we can substitute the values into the formula:

W = 3A x 12V x 7200s = 259,200 Joules

To convert the work into kilojoules, we divide by 1000:

W = 259,200 J = 259.2 kJ

Therefore, the work done by the battery charger is 259.2 kilojoules.

Answer 2

Answer: 259.2 KJ

Step-by-step explanation:

The formula calculate work don in a circuit is given by :-

`W=QV`, where Q is charge and V is the potential difference.

The formula to calculate charge in circuit :-

`Q=It`, where I is current and t is time.

Given : Current :
`I=3A`

Potential difference :
`V=12\ V`

Time :
`t=2\ hr=2(3600)\text{ seconds}=7200\text{ seconds}`

Now,
`Q=3(7200)=21,600\ C`

Then,
`W=(21600)(12)=259,200\text{ Joules}=259.2\text{ KJ}`

Hence, the work done = 259.2 KJ