Currents and Heat (2/2) : 無料・フリー素材/写真
Currents and Heat (2/2) / tdowd1982
| ライセンス | クリエイティブ・コモンズ 表示-継承 2.1 |
|---|---|
| 説明 | Household electrical circuits are wired in parallel. One prong on each plug goes to to one side of the circuit, and the other to the other. As you saw from the parallel circuits lab, this means that currents ADD each time you plug a new device in. In the wires that are carrying electricity to more than one device, this can make them get dangerously hot. Each diameter (gauge) of wire can safely handle a certain amount of current before it gets too hot. A standard household circuit in the United States is wired with wires fat enough to handle 15A of current without getting too hot. This photo shows all 3 currents flowing through a 15A fuse wired in series with the 3 parallel devices. It would be unsafe for these wires to be carrying more than 15A, and thus this fuse is designed to melt if that happens. This is what "blowing a fuse" means. It will cut power to everything. To fix the problem, you'd unplug one device, and put a new fuse in.In a modern house, fuses have been replaced with reset-able circuit breakers, which are more convenient. Fuses are still used in cars and to protect individual devices or powerstrips. |
| 撮影日 | 2016-03-30 07:35:06 |
| 撮影者 | tdowd1982 |
| 撮影地 |