What kinds of devices make work easier by reducing required effort or by changing the direction of required effort?
Levers multiply the mechanical force that can be applied to another object, thus making work easier.
Alternating currents travels in only one direction and is the type of current that most electronic devices require including computers?
A display device such as a screen or monitor is an output device. Right from here we can already say that a display device is required to be able to visibly know what we are doing on a computer. (Even if you have a remote connection to that device you will be using a display device to view the contents of the remote device using another computers monitor.) Printers and speakers are examples of output…
A "diode" is any of several devices; the only thing they have in common is that they have two electrical connections - hence the name. These devices have different functions. The simplest semiconductor diode, and one of the most common, is probably the rectifier diode. It lets current pass in one direction, but not in the other direction.
anemometer is the device used to measure wind speed .There different type of Anemometers . There is one with rotating axel which is designed with cups shaped blades placed on the axel to rotate it . Another is that uses pressure difference to measure speed and are in shape of flat plates . These plates a have spring balancing the pressure differences between tail and head.
Electronic devices works on low level dc voltage like 48volts and less than that. We cannot give direct line supply to electronic devices, for this transformer is used to convert ac voltage to required dc level... Whereas in electric devices we can use direct line supply (110V/220V) ac. These devices can also be operates on dc volts but greater than 48volts