The five electrical equipment that I think are most useful are:
1) mobile phone: because if you are in a trouble you can call the police
2) laptop computer: it's very useful because allows you work anywhere
3) microwave oven: because you can cook very quickly
4) remote control: because if you are on the sofa you can change the channel only pressing a button
5) MP3 player: because I like listen music when I'm running