California will now require social media companies to moderate the spread of election-related impersonations powered by artificial intelligence, known as “deepfakes,” after Gov. Gavin Newsom, a Democrat, signed three new laws on the subject Tuesday.

The three laws, including a first-of-its kind law that imposes a new requirement on social media platforms, largely deal with banning or labeling the deepfakes.

Only one of the laws will take effect in time to affect the 2024 presidential election, but the trio could offer a road map for regulators across the country who are attempting to slow the spread of the manipulative content powered by artificial intelligence.

The laws are expected to face legal challenges from social media companies or groups focusing on free speech rights.

Deepfakes use A.I. tools to create lifelike images, videos or audio clips resembling actual people. Though the technology has been used to create jokes and artwork, it has also been widely adopted to supercharge scams, create non-consensual pornography and disseminate political misinformation.

Elon Musk, the owner of X, has posted a deepfake to his account this year that would have run afoul of the new laws, experts said. In one video viewed millions of times, Mr. Musk posted fake audio of Vice President Kamala Harris, the Democratic nominee, calling herself the “ultimate diversity hire.”