## What is active and passive sign convention?

Active sign convention: the reference direction of the current variable (the arrow representing the direction of positive current) points into the negative reference terminal of the voltage variable. Passive components will have negative resistance and negative power flow.

**Why do we use passive sign convention?**

The reason for this convention is so the signs of current and voltage come out right when we apply the defining equations for each component, like Ohm’s Law for a resistor.

**What is active sign convention?**

Active Convention Active sign convention is used for devices that deliver voltage to a circuit, for instance, batteries or discharging capacitors. On most components these terminals are clearly marked, and reversing them will provide a negative voltage.

### Which is positive and negative on a capacitor?

Electrolytic capacitors have a positive and negative side. To tell which side is which, look for a large stripe or a minus sign (or both) on one side of the capacitor. The lead closest to that stripe or minus sign is the negative lead, and the other lead (which is unlabeled) is the positive lead.

**Do resistors always absorb power?**

A resistor can absorb power, but not deliver it. We apply Ohm’s law to equation \eqref{POW-PVI} to produce two additional formulas for the power of a resistor. In words, a resistor can absorb power (by converting electrical energy into heat energy), but can never deliver power.

**Can you have negative resistance?**

It’s not possible to get a negative resistance with purely passive components. We can see that from thermodynamics. A normal (positive) resistor puts out heat to the surroundings – voltage times current gives us the power dissipated. A negative resistor would need to suck in heat and turn it to electrical energy.

## Is Ground positive or negative?

This is also often referred to as negative ground, i.e. the negative line is used as the ground – also referred to as return or common – and the positive line is the “hot” line which carries the +12 or +24 volt potential.

**Is there a positive and negative in a fan capacitor?**

there is no “positive” or “negative” wire, because it is AC. All wires that were connected before must be connected after. one possible solution is: * capacitor black wire — to–> black, black, red wire of fan.

**Is more power dissipated in series or parallel?**

The power dissipated by each resistor is considerably higher in parallel than when connected in series to the same voltage source.