What does it mean when the current is negative?
Negative current is current flowing in the opposite direction to positive current, just like the axes on a graph have negative and positiva in opposite directions. A sensor that can read negative and positive current could be used to mesaure rate of charging or discharing a battery.
What does negative electric power mean?
Power is a signed quantity; negative power just represents power flowing in the opposite direction from positive power. This increases the potential energy of the electric charges, so electric power flows out of the component into the circuit.
How to obtain negative voltage from a DC power supply?
If you want to connect negative voltage with earth ground, then all you have to do is tie the earth ground terminal of the DC power supply and the positive terminal common. This makes the positive terminal grounded to earth.
What happens if you have a negative polarity power supply?
If you have a negative polarity power supply, then you will get a negative reading. You should then switch the position of the multimeter probes. Figure 5. Red probe goes into the tip Plug your power supply into an AC outlet. Black probe touches the barrel as shown in Figure 5. Turn on your multimeter and set it to read DC voltage.
What is the symbol for a positive power supply?
Symbol for a center-positive power supply. Figure 4. Symbol for a center-negative power supply. It is always good practice to test a power supply before using it for the first time. The example below will show how to test a power supply with positive polarity. If you have a negative polarity power supply, then you will get a negative reading.
How to access negative voltage from AC mains?
Circuit for negative voltage from AC mains. The circuit is built around a transformer, clipping diode and a negative voltage regulator. First of all, we use a 24V transformer to get 24V AC supply. The diode in reverse bias condition acts as a positive clipper.