Watt, Power Factor, Ampere, Voltage, Voltage-Ampere
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What's power factor and voltage-ampere?
What is/are the relationships between the 5? -
I heard that for pure science classes ... today last day of O levels... true or false?
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Me poly liao...
This is killing me... Physics is my weakest point and I'm doing a module on it.
And I can't find anything useful for my understanding.
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the worst thing is... if you do not use this information after poly... your own brain will get rid of the information that you learn with so much difficulty for the sake of efficiency and conserving storage space...
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http://en.wikipedia.org/wiki/AC_power
P = real power (in W or Watt)
S = apparent power (in Voltage-Ampere or VA)
Q = reactive power or imaginary power (in VAr)
there is a power triangle to get the relation between them. -
The power factor of an AC electric power system is defined as the ratio of the real power to the apparent power.Originally posted by ndmmxiaomayi:What's power factor and voltage-ampere?
What is/are the relationships between the 5?
Real power is the capacity of the circuit for performing work in a particular time. Apparent power is the product of the current and voltage of the circuit.
They are different due to power loss and power stored in components of the circuit.
if i'm not wrong VA is the apparent power -
to put it into English... one is what the power station produces and the other is what the consumer really consumed.... why is there a difference... ah... there are many reasons for that...
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This is from electrical engine side. WTF is mayi jie jie taking?
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apparent power is usually refer to wat the limitation the equipment can do.
what the actual fact is when u switch on ur equipment, the power u see is usually less than dat. tis is wat we call the real power. -
If I want to continue in the IT field... most likely I will touch it... but I doubt I will... because Physics is my weak point...Originally posted by AndrewPKYap:the worst thing is... if you do not use this information after poly... your own brain will get rid of the information that you learn with so much difficulty for the sake of efficiency and conserving storage space... -
Apparent power = current X voltage = I X VOriginally posted by hisoka:The power factor of an AC electric power system is defined as the ratio of the real power to the apparent power.
Real power is the capacity of the circuit for performing work in a particular time. Apparent power is the product of the current and voltage of the circuit.
They are different due to power loss and power stored in components of the circuit.
if i'm not wrong VA is the apparent power
Sounds like the real power? -
Business Continuity Technologies - calculating power and don't know what crap in case of power failure.Originally posted by Herzog_Zwei:This is from electrical engine side. WTF is mayi jie jie taking? -
Provided that Internal Resistance is zero.Originally posted by ndmmxiaomayi:Apparent power = current X voltage = I X V
Sounds like the real power?
Even wires and conductors eat power.
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Real Power Output may not be equal to Apparent Power Output. You can view real power as the useful power that came out and apparent power as the power that should be observed.Originally posted by ndmmxiaomayi:Apparent power = current X voltage = I X V
Sounds like the real power?
This is because in real life, nothing is perfect, whereas in physics, most calculations assume perfect conductors, perfect this perfect that...
The power loss can come from internal impedance, parasitic capacitance or inductance. Some power are also imaginary; power can be calculated in terms of complex numbers.
In view of the above information, you can also summarize that real power <= apparent power.
Hence, because power factor is real power / apparent power,
power factor <= 1 -
Watt is a unit of measurement for power.Originally posted by ndmmxiaomayi:What's power factor and voltage-ampere?
What is/are the relationships between the 5?
Power Factor will have no units since it is real power divided by apparent power..
Ampere is a unit of measurement for current.
Voltage is a unit of measurement for potential/potential difference.
Never really heard of voltage ampere, but from the names, it sounds like it is also power because P = IV. From the definition above that someone give about apparent power, it may be that this is used as a measurement for apparent power. Of course, 1 W = 1 VA. -
True.Originally posted by AndrewPKYap:I heard that for pure science classes ... today last day of O levels... true or false? -
hahaha..
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as said, real power is the useful power that comes out. like say a simple circuit with a batt and a light bulb.Originally posted by ndmmxiaomayi:Apparent power = current X voltage = I X V
Sounds like the real power?
real power is the power delivered to the light bulb. apparently power the the theopritically total power a.k.a. real power + losses due to capacitance, heat/resistance in the wires