The aggregate power need for all rings may be ~7KW assuming they are all on max.
Reality is that at any one time even if all rings are in use, some will be on low or simmer. So you won't even know that the power being drawn may only be between 1-3KW
A bit like a car - there may be 200bhp under the bonnet. Only rarely are all those horses used 4-6000rpm accelerating hard. 50-60bhp is used at 70-80 mph on the motorway. Blips up to 100bhp may get used to overtake or pull on to a roundabout sharply!
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