But how and what causes these changes to the earthâs surface? There are basically 2 types of changes that occur to the earthâs surface (i) Slow change and (ii) fast change. Fast changes occur through the actions of Earthquakes, volcanoes, landslides, etc. while slow change takes time and has a process.
People used to use hubs over switches because switches were much more expensive than hubs, but nowadays it's pretty standard to get a switch if you have several devices on the network since they're both around the same price. dbhosttexas. February 13, 2013 4:14:00 PM.
Switches are used to switch the loads on and off whenever necessary. Hence, the source, the load, and the switch are connected together to form electrical circuits. The circuit is called 'closed' when the current flows in the circuit, and when the current does not flow, it is called an 'open circuit'. The switch or key helps to make or break the circuit, i.e. switches on or switches off the current. Sub Topics. Components of An Electric Circuit.