[ Better than Googling it...read the book “One Second After” ...
I’ve read it and while it is fiction, I don’t doubt that’s exactly what will happen. ]
I think about 50% of our electrical devices will be crapped out after a mid nation space based EMP. 20% will work for a while but be damaged enough to where they will fizzle out ahead of time. The rest will continue to work and will be items with more robust circitry, thinks like refrigerators will still work as they have a steel “shell” around them that is grounded and most of them have simple circitry. Microwaves may survive if they are heavy duty shielded types, cheap one will more than likely break.
The main issue will be the electrical grid. It will take a while to bring it back online and a lot of people in hospitals may die in the meantime. People who work IT jobs will be in a nightmare as they wait for new parts to get in from China.
It will be very very very bad, but not “Post apocalyptic”. Most of us will get knocked down to the 60’s after the power is restored 2-3 weeks after the initial attack. It may be the only thing that actually “Wakes up the Sleeping Giant”.
All you have to do is look what happend to the Miami Area in 2005 after Hurrican Wilma hit........ NO power.
EVERYTHING came to a grinding halt. the only saving grace were backup generators - and those would be slag in an EMP strike.
No power, no electronics- which means cars, appliances, computers, Cellphones, IPODS, IPADS..........
NOT a happy prospect.