BBC2 年
KS2 Science: How do electrical circuits work?
Hi! I'm Mwaksy. Hey, I'm Greg.Greg, a question for you. Yes?How do you get from this… Mm? …to this?Skills! How'd you do that? I'm very glad you asked,because that ...
来自MSN2 个月
What is a Circuit Breaker and How Does it Work?
Because they’re safety devices, circuit breakers have to work automatically. (Of course, you can also operate them manually, which you should always do when doing DIY electrical work.) ...