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

Answer

Potential difference applied across the resistance is 60 V.

Explanation

`"Given: Resistance (R) "=9Omega," Heat (H) = 400 J,"`
Time `(t)=1s`
`"To find: Potential difference (V)"`
`"Formula: H"=(V^(2)t)/(R)`
`"Calculation: From formula,"`
`V=sqrt((HxxR)/(t))`
`=sqrt((400xx9)/(1))`
`=sqrt(400)xxsqrt(9)`
`=20xx3`
`=60V`