How many watz in 20 ampers?

To calculate watts from amps, you need to know the voltage. Using the formula ( \text{Watts} = \text{Amps} \times \text{Volts} ), if you assume a standard voltage of 120 volts, then 20 amps would equal 2,400 watts (20 A x 120 V). If the voltage is different, you would need to adjust the calculation accordingly.