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Because that's the definition of "Alternating Current" ... one which 'alternates'
between positive and negative. If it didn't do that, then it wouldn't be AC.
(Even if its instantaneous amplitude varied sinusoidally, if it always remained
positive or always negative, it could be described as the sum of an AC plus a
pure DC, or simply as a pulsating DC.)
What else can I help you with?
You are wiring a LED lamp through a transformer you have a polarized plug and you know positive and negative The transformer is marked live and neutral Does live correspond with positive or negative?
LED's are DC voltage. Transformers are AC voltage. There is no positive or negative on AC voltage. You would need a diode to change the AC to DC, then there would be positive and negative voltages.
Do ac capacitor have positive and negative polarity?
both
Can you represents three phase ac with positive and negative?
AC is normally referred to as active and neutral, while DC is referred to as positive and negative. "Can you represents three phase ac?" not sure what you mean here. Each of the three phases are active ( positive ) so you could not represent one of them with negative. Hope this helps.
Does the AC outlets have a positive and negative terminals?
No, AC outlets do not have positive and negative terminals like DC outlets. AC outlets have hot and neutral terminals, with the hot being the live current-carrying wire and the neutral being the return path for the current.
If wall current is said to be alternating why does it have a positive and a negative?
AnswerThere is no positive and negative. There is hot and ground. The hot (120 volts AC) is in reference the ground (Earth).
What color is green positive or negative for DC?
green is ground regardless of ac or dc
Does a 220 volt ac contact get a positive and a negative?
A 220 vac circuit has 2 hot wires and a neutral. The neutral stays at 0 volts and the hot wires vary between positive and negative. When one is positive, the other is negative.
Why all telecom dc powered equipment is designed with negative inputs like -48 -60?
AC currents alternate from AC to DC in a constant wave. The DC current is a direct and consistent current demonstrated to the negative reading. AC traveling from negative to positive and DC traveling in negative.
If an AC begins rising positive as 0 degrees when will it reach its negative maximum current?
Maximum negative current is at 270 degrees.
How do you tell a positive wire from negative wire with colors?
In a DC circuit Red is positive and Black is negative. In AC systems White is neutral and Ground is green or green-yellow stripe.
What current has negative and positive polarity?
Alternating current (AC) has both negative and positive polarity as it periodically reverses direction. In AC systems, the voltage oscillates between positive and negative values, which allows electricity to be transmitted efficiently over long distances. This is in contrast to direct current (DC), which flows in only one direction and maintains a constant polarity.
What does multiplication property of inequality mean?
If a < b, and c is positive, then ac < bcIf a < b, and c is negative, then ac > bc(inequality swaps over!)
