0
Current passing through a resistor, et al, causes heat. The heat causes the resistance of said resistor to decrease, which causes current to increase, and the cycle just keeps going until the circuit burns out.
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
What is a vernier potentiometer?
A variable resistive device
Why are resistors called resistors?
Resistors have resisting power(resists the electric power).Due to having the resistive property, the name resistor is given to such electrical device.
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
When is a transformer closet to unity power factor?
When it supplies a resistive load.
What is the power when a voltage of 120V drives a 2-A current through a device?
Power is volts time amps, so 120 V time 2 A = 240 W. That is, of course, assuming that the voltage is DC, or the load is purely resistive. If there is any capacitive or inductive reactance in the device, and the voltage is AC, the true power will not be equal to the apparent power because of a phenomenon called power factor due to phase angle of voltage not being equal to current.
How many watts in 1500VA?
Watts = Volts x Amps x Power Factor. To answer your question requires that the Power Factor be know. The Power Factor ranges from zero to one and is one for a pure resistive load. If your device is resistive the answer is 1500 watts.
What is a vernier potentiometer?
A variable resistive device
Why are resistors called resistors?
Resistors have resisting power(resists the electric power).Due to having the resistive property, the name resistor is given to such electrical device.
If the voltage in a resistive is double the power will be?
In a resistive load circuit, the power = multiplication of voltage and Current. By increasing the voltage power will not be increased. Power is defined by the load as per its design. If the voltage is higher the load current will reduce. However running a load at double the rated voltage is not good for the device. Insulation may fail.
The power factor of a purely resistive circuit will be?
The power factor of a purely resistive circuit is 1.0.
In a circuit with resistive and inductive load what happens to the power factor as the resistive load increases?
The PF will increase
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.
What is the wattage required for a device drawing 35 amps?
Watts = Volts x Amps x Power Factor To make your calculation you need to plug-in the Voltage and Power factor. The Power Factor is a value from zero to one with one being a pure resistive load.
When is a transformer closet to unity power factor?
When it supplies a resistive load.
Which device you should use to prevent the effects of fluctuation in the power supply on your PC and to continue to work for a specific time even if there is no power?
Uninterruptable Powersupply
What is a 1k?
It is a passive electrical device with a resistive value of 1000 ohms, used for limiting current or dropping voltage.
