Answer this plz for 10 points and a shiny gift?

technological resources: telephones, fax machines photo copiers, over head projectors etc.

for each type of machinery i need say the use for each one, why its more effective and its performance.

pick one or more and help me plz

The Overhead Projector (OHP) was invented specifically for teaching.It means you can face your class, write/draw,/place info on to a transparency so that it appears ona screen behind you for your pupils to see. Telephones simply enable people to talk over long distances. Fax machines enable documents/pix to be sent via phone lines for instant transmission. Photocopiers produce multiple copies of documents. Hope this helps.

telephones = data or voice communication over long distances
fax machines = sending and receiving data transmissions over phone lines and printing the data
overhead projectors = useful as a means to present charts and other information to small groups.