Question

A 12 V storage battery is charged by a current of 20 A for 1 hr. A) How much power is required to charge the battery at this rate? B) How much energy has been provided during the process?

Answer 1

Answer:

A) 240 W

B) 864000 J

Explanation:

Hi!

We can easily calculate the required power multiplying the voltage of the process times the circulating current:

$P=12V\times 20A=12(\frac{J}{coulomb})\times20(\frac{coulomb}{s})\\P = 240\frac{J}{s}=240W$

To calculate the total energy provided we need to multiply the power times the total time:

$E=P\times t=240\frac{J}{s} \times 1 hr =240\frac{J}{s} \times 3600s\\ E=864 000J$

Hope this helps

Have a nice day!