For example, electric cars are quiet, electric drills/lawn mowers are noisy
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Electric motors make noise due to friction between rotating parts. This differs from combustion motors like gasoline powered engines that make a lot of joise due to the internal explosions that run them. All electric motors can be designed to be quiet, but a quiet motor is harder to build, design, and maintain and as such is more expensive. In applications where friction is already being avoided, such as in a car, the motor will be quieter by comparison.
Another thing to consider is that a car motor has a lot of stuff around it to block the sound while a hand drill motor doesn’t. You also hold the hand drill pretty close to your ears while you’re never going to stick your face right up to an electric car motor. This means that you’re not really making an “apples to apples” comparison for noise.
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