Electric kettles are much less powerful on a 120v circuit (US household) than a 240v circuit (ie uk). A quick look at an online retail shop confirms british kettles are rated at 3000W, while american ones are 1500W.
I actually have a bit of a hack when I'm in a major rush - I'll put half the water I need in the electric kettle, and half on the stovetop.
Yeah, the maximum rated output for a standard US electrical outlet is 1500W. Alec Watson of the YouTube channel Technology Connections[1] did an interesting video a while back about the fact that basically all plug-in electric heaters sold in the US output 1500W.
I actually have a bit of a hack when I'm in a major rush - I'll put half the water I need in the electric kettle, and half on the stovetop.