Adiffraction grating with 240 lines per mm is used in an experiment to study the visible spectrum of a gas discharge tube. at what angle from the beam axis will the third order peak occur if the tube emits light with wavelength of 511.3 nm?

if i understood you you wish to calculate power from voltage and current.

we have voltage of 220 volts and current of 5.3 amperes. the power is equal to the product of voltage and current.

where p is power, u is voltage and i is current.

so,

hope this .

r3t40