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Power=current squared times resistance
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∙ 14y ago
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What is meant by apparent impedance?
You may be mixing up 'impedance' with 'apparent power'.Impedance is the vector sum of an a.c. load's resistance and reactance, and is expressed in ohms. Apparent power is the vector sum of true power and reactive power, and is expressed in volt amperes.Apparent power is also the product of the square of the load current and the impedance of the load.
If resistance is constant and voltage increases what happens to current?
You have it backwards, the resistance controls the current not the current controls the resistance. I = E/R . Your question should read, "If the voltage is constant and the resistance in the circuit is increased what happens to the current?" Say the voltage is 120 volts and the resistance is 30 ohms, I = 120/30 = 4 amps. Now we double the resistance to 60 ohms, then I = 120/60 = 2 amps. So now you can see if you increase the resistance the current drops.
Why the power must be off when checking the resistance in the circuit?
an ohmmeter contains its own power source that it uses to test the circuit. if power is still on in the circuit, at the least the meter will give incorrect readings, at the worst the meter may be damaged rendering it useless.
Does the resistance of a light bulb filament change after the light has been turned on?
The electrical resistance of a light bulb increases when it is turned on As a resistor, the tungsten light bulb has a positive resistance coefficient. This means that the electrical resistance goes up when the filament becomes hot. For example, a 100 watt light bulb operated at 120 volts - it does not matter if it is AC or DC for this calculation - will have a resistance of 144 ohms when hot and draw .833 ampere. When cold the filament typically has a resistance of only 10 ohms which increases as the filament heats up.
How do you calculate output power of DC series motor?
For single phase the formula is HP = I x E x %eff. x pf/746. For three phase the formula is HP = I x E x 1.73 x %eff. x pf/746. Where I = amps, E = volts, %eff. = efficiency of the motor and pf is the power factor of the motor.
What is meant by apparent?
You may be mixing up 'impedance' with 'apparent power'.Impedance is the vector sum of an a.c. load's resistance and reactance, and is expressed in ohms. Apparent power is the vector sum of true power and reactive power, and is expressed in volt amperes.Apparent power is also the product of the square of the load current and the impedance of the load.
What is meant by apparent impedance?
You may be mixing up 'impedance' with 'apparent power'.Impedance is the vector sum of an a.c. load's resistance and reactance, and is expressed in ohms. Apparent power is the vector sum of true power and reactive power, and is expressed in volt amperes.Apparent power is also the product of the square of the load current and the impedance of the load.
What is the length as a power of 10?
Length is not a value in itself. It is an attribute of objects and, in the context of an object, it may have a value. That value can be expressed as a power of 10.Length is not a value in itself. It is an attribute of objects and, in the context of an object, it may have a value. That value can be expressed as a power of 10.Length is not a value in itself. It is an attribute of objects and, in the context of an object, it may have a value. That value can be expressed as a power of 10.Length is not a value in itself. It is an attribute of objects and, in the context of an object, it may have a value. That value can be expressed as a power of 10.
Efficiency can be express mathematically as?
Efficiency = Output/Input. This is usually expressed as a percentage but may be given in the form of a ratio.Another AnswerEfficiency is output power divided by input power, normally expressed as a percentage.
Does air resistance makes objects go slower?
Air resistance does tend to slow things down, which may cause them to move more slowly. However, if you keep applying power - such as a jet engine - you can overcome the resistance and keep going.
The expressed congressional power to borrow money implies that congress may-?
Establish the federal reserve system
What is the use of resistance?
In electronic circuits, resistance is used to empede the flow of current. You may want a specific voltage at a given location, so by using resistors, you can obtain that voltage. You may want to limit current, which a resistor can do for you. But resistance is inherent in everything. Copper wire has resistance, your toaster is really nothing more than a resistor. Resistance is generally considered the load in electrical systems. If it were not for resistance, everything would be considered a short circuit. So you see resistance, although many times not desired, is required.
1986 ranger loses power then backfires at times may or may not die?
check your timing
Which of these is the most significant of the expressed presidential powers?
The most important of the expressed presidential powers in the United States is probably the power to veto. A president who passes laws just to agree with Congress is not going to achieve the goals they set forth when running for office.
Which power is product of voltage and current in a circuit calculated without considering the phase shift that may be present between the voltage and current?
I'm not sure there is a term other than "power"; V*A, or the vector sum of real and reactive power is equivalent to the power calculated by multiplying the voltage times the current, ignoring phase shift.AnswerThe product of voltage and current in an a.c. circuit is called 'apparent power', expressed in volt amperes, in order to distinguish it from 'true power' (in watts) and 'reactive power' (in reactive volt amperes).
In what seven types of quantities may all physics measurements be expressed?
seven types of quantities may all physics measurements be expressed?
What Is expressed in gram kilograms or milligrams?
Mass is the amount of matter present and may be expressed in mg, g, kg ; and in lbm and in slugs . Weight, W , is the gravitational force on a given mass and may be expressed in N or in lbf .
