Phillips head screwdriver

Transformer, 120V to 12V, 450 ma, center tapped Portable AM/FM radio Multimeter (or "multitester") t Lamp bulb, tungsten, 12 volt dc, green or blue Fuse, fast-action, 315 ma, 5 x 20mm t Phillips head screwdriver, for replacing fuse Color code slide rule Resistor, 100 ohm, 10 or 1 watt Resistors, 150, 180, (1/2 or 1/4 watt)... 

The milliampere settings make the meter especially vulnerable to being damaged by excessive current, since there is no internal resistor being used to act as a limiter. If a battery is directly attached to the meter by mistake, with no external resistance such as the transformer, the fuse will blow out, and the meter will no longer operate. The back cover can then be taken off, usually with a small Phillips head screwdriver, and in this case the fuse could be replaced with a 315 ma fast-blow type. 

Screwdriver used to tighten and loosen screws and bolts slotted head (single groove or slot), Phillips head (two grooves or slots crossing at 90°)... 

The most commonly used type of screwdriver for computers today is the Phillips driver (Figure 1.16). Phillips-head screws are used because they have more surfaces to turn against, reducing the risk of damaging the head of the screw. More than 90 percent of the screws in most computers today will be Phillips-head screws. 

Combining Tools We use different hand tools during combining processes. We use screwdrivers to install and remove screws. Screwdrivers have tips that match the type of screw on which they are used. We use slotted screwdrivers on slotted-head screws and the Phillips screwdriver on Phillips head screws. Some screws have square drives, hex drives, or torx drives. Figure 8-19 shows various types of screwdrivers. It is important to select the appropriate size and type of screwdriver when installing or removing a screw. 

PhilUps-head screw (Henry M. Phillips) The Phillips-head screw has an X-shaped slot in the head and can withstand the torque of a machine-driven screwdriver, which is greater than the torque that can he withstood by the conventional screw. 

Screwdrivers. A medium and a large Phillips (+) and flat-head (—) is a great place to start. 

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