The alternating current (AC) Is a type of electric current in which the direction of the flow of electrons comes and goes at regular intervals or cycles. The direct current (DC) I s the electric current that flows constantly in one direction, which flows in a flashlight or any other device with battery is direct current. INPUT AND OUTPUT DEVICES Input and output devices are those that allow the communication between the computer and the user. MULTIMETER A multimeter is a measuring instrument that offers the possibility to measure different electrical parameters and quantities in the same device. POWER CABLE A power cable serves to connect appliances or any other electrical device to mains supply via a socket or connecting to an electrical extension cord. AT POWER SUPPLY Motherboard. The two remaining types, of which there is a variable amount, feed devices not plugged into a slot on the motherboard, such as hard dis