Fill in the Blanks IGCSE Theory Chapter 2: 2.1 - Input and Output DevicesOnline version Please read the sentences carefully, use your textbook/Slide Notes to help you fill in the blanks. by Jerez Rolle 1 Input Devices allow data to be into a computer . A mouse , touch pad and a tracker ball are know as devices . A touch pad is built into the . It is more difficult to use compared to a . A numeric key pad could be used at an or terminals . Remote control can be used at a . for sound and for video can be used in a web conference . Sensors read in signals . Computers read in signals . An is required to convert the signal so that it can be understood by the computer .