Manual Base Unit   The Manual Base Unit contains a total of 32 Circuit  Modication (CM)And fault switches. Students manually  select CM switches as the course progresses, while the  protected fault switches are reserved for Instructor use by means of an integrated, locking- cover assembly.   Base Unit Familiarization   DC Fundamentals Circuit BoardFamiliarization   Symbols and Schematics   Basic Safety Rules   Electrical Safety Rules   Circuit Resistance, Circuit Current, Circuit Voltage   Assembly of simple circuits   Use of voltmeters and ammeters   Ohm's law .   Series and parallel connection of resistors   Voltage dividers with and without loads   Light bulb characteristics .   Voltage dependent resistors ( VDRS ) .   Negative temperature coecient thermistors ( NTCS )   Positive temperature coecient thermistors ( PTCs )   Capacitors in DC circuits   Relay circuits