The first is likely a specific point of the assignment.Whoever wrote the assignment knows nothing about electricity.
1) -5V and 0V is the same as +5V and 0V since EARTH is not mentioned.
2) No current?
|Thread starter||Similar threads||Forum||Replies||Date|
|DC to DC power source which can convert +/-12v or +/-15v to +/-120v||Datasheets, Manuals & Parts Identification||2|
|M||How to convert a battery operated 3.7v 3000mAh flashlight to direct wire 120v power.||Power Electronics||3|
|T||Convert 120v to 230v - audio amplifier||Analog & Mixed-Signal Design||10|
|S||convert 115v 50hz to 120v 60hz||General Electronics Chat||9|
|P||Convert variable DC to 120V 60Hz AC||General Electronics Chat||3|