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2. Objectives Identify the parts and connectors of a PC Power Supply Unit (PSU) Select and install a PSU appropriate to a given PC system Unit 1.3 Power SuppliesSlide 2

3. Electrical Circuits Voltage – Potential difference – Volts Current – Flow of electrons – Amps Resistance – Conductivity – Ohms (R) Power – Watts – Volts * Amps AC versus DC Unit 1.3 Power SuppliesSlide 3

4. Electrical Components Conductor Insulator Semiconductor Resistor Diode Fuse Transistor Capacitor Unit 1.3 Power SuppliesSlide 4

5. Power Supply Unit (PSU) AC – DC (3.3V, 5V, 12V) power conversion Dual voltage (110 vs 240 VAC) options Maximum power output / wattage / sizing Form factors – ATX – SFX12V (smaller all round) – TFX12V (long and narrow) Unit 1.3 Power SuppliesSlide 5

6. Connector Types and Voltages ATX – 20-pin P1 (±12V, +5V, and +3.3V) – 4-pin Molex (+12V and +5V) – 4-pin mini-Molex (or Berg) – 6-pin AUX (+5V and +3.3V) ATX12V v1.x – 4-pin +12V – SATA (optional) ATX12V v2.x – 24-pin P1 – SATA (+12V, +5V, and +3.3V ) – 6- and 8-pin PCIe (+12V) EPS12V – 8-pin +12V Unit 1.3 Power SuppliesSlide 6

7. Installing a PSU Remove connectors Unscrew from case Install new PSU – set AC input type if manually switched Make power and fan connections to motherboard and storage drives Unit 1.3 Power SuppliesSlide 7

8. Review Identify the parts and connectors of a PC Power Supply Unit (PSU) Select and install a PSU appropriate to a given PC system Unit 1.3 Power SuppliesSlide 8

9. Labs Lab 2 Identifying PC Components Unit 1.3 Power SuppliesSlide 9