"If I'm correct the gas oven only has a heating element that draws power. "

Usually the only electric items are spark ignitors, glow-plug ignitors for ovens, and clocks or timers.

The name plate for the oven (look on the edge of the door opening) will list its power use.

If I'm correct the gas oven only has a heating element that draws power.

Some gas oven have an supplemental electric element or a electrically heated warming drawer. As Brickeyee said you look at the name plate or check the owners manual for electrical requirements.