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What else can I help you with?
Why do you think as the voltage across a lamp changes the power consumption?
Because the power of a resistive component is directly proportional to the square of the voltage across that component.
The power factor of a purely resistive circuit will be?
The power factor of a purely resistive circuit is 1.0.
Is a wattmeter required to measure the active power delivered to a resistive load?
No. If the load is truly resistive, just measure the voltage across the load (in volts)and the current flowing in it (in amps) and multiply them. eg: 115 volts at 1.5 amps = 172.5 watts.
What is the nature of power factor and its variation with firing angle when a single phase voltage controller feeds a resistive load?
With a pure resistive load the Power Factor should be 1.
What is the approximative power factor of an incandescent lamp?
Incandescent lamps are nearly pure resistive loads with a power factor of 1
Why do you think as the voltage across a lamp changes the power consumption?
Because the power of a resistive component is directly proportional to the square of the voltage across that component.
A bulb has power 40W and it is operated 110Volts. what is the energy produced in one second?
A 40 Watt bulb emits 40 Joules each second. ( the operating voltage is irrelevant )
How do you convert 110volts to kVA?
You must know the current or resistance to convert voltage to power.
The power factor of a purely resistive circuit will be?
The power factor of a purely resistive circuit is 1.0.
How many watts make 8amps of 110volts?
Power = E I = (110) x (8) = 880 watts
In a circuit with resistive and inductive load what happens to the power factor as the resistive load increases?
The PF will increase
Which relationship is true of power factor?
Power factor is:the ratio of true power to apparent powerthe ratio of resistance to impedancethe ratio of the voltage across a circuit's resistive component to the supply voltagethe cosine of the phase angleetc.
Is a wattmeter required to measure the active power delivered to a resistive load?
No. If the load is truly resistive, just measure the voltage across the load (in volts)and the current flowing in it (in amps) and multiply them. eg: 115 volts at 1.5 amps = 172.5 watts.
Power factor for pure resistive circuit?
ratio between true power and apparent power is called the power factor for a circuit Power factor =true power/apparent power also we conclude PF=power dissipated / actual power in pure resistive circuit if total resistance is made zero power factor will be zero
What is the nature of power factor and its variation with firing angle when a single phase voltage controller feeds a resistive load?
With a pure resistive load the Power Factor should be 1.
When is a transformer closet to unity power factor?
When it supplies a resistive load.
Why natural trend to lagging power factor?
Power factor is the cosine of an AC circuit's phase angle, where the expression phase angle is the angle by which a load current lags or leads the supply voltage.Lagging phase angles and power factors occur in resistive-inductive circuits. Leading phase angles and power factors occur in resistive-capacitive circuits.Most industrial and commercial loads are combinations of heating (resistive) loads and motor (inductive) loads -in other words, resistive-inductive loads. Accordingly, lagging power factors tend to be more common than leading power factors.
