A cell is connected to a 9 ohm resistance, beacause of which heat of 400 J is produced per second due to current following through it.Obtain the potential difference applied across the resistance.

Explanation

Given:
Heat at 400 J per second means
`P= (400J)/(1s)`
` P=(V^(2))/(R)`
`400 = (V^(2))/(9)`
`400 xx 9 = V^(2)`
`:.V=sqrt((400xx9))=20xx3=60V`