Question

400 j of heat is produced each second in a 9ohm resistance. find the potential differences across the resistor​

Answer 1

Answer:

60V

Step-by-step explanation:

Power is energy/time=400/1=400W

Also we know

$power = \frac{ {v}^{2} }{r}$

$400 = {v}^{2} \div 9$

${v}^{2} = 400 \times 9$

$v = 60$