Why a generator slow down with resistive loading?

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This means that there is less current in the coil, therefore less force acting on the rotor, resulting in less resistance and strain on the motor.In summary, a generator slows down with resistive loading because the induced current in the coil experiences a force that opposes the original motion, making it harder for the motor to turn. This does not happen with capacitive or inductive loads because they do not dissipate power like resistive loads do, resulting in less resistance and strain on the motor.
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eng_pro
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anyone here know why a generator slow down with resistive loading ?

i did an experiment and my results showed that when i loaded the generator more and more the frequency dropped from 50Hz to about 47Hz
(power factor was unity all the time)
 
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  • #2
Consider the induced current in the coil as a result of the turning of the armature. [Read up on the motor effect]. This current experiences a force that is opposite in direction to the motion that induced the current. So this means that when we add a load, more has to be supplied; more current in the coil; a stronger force acts on the rotor but in a direction that opposes the original motion; thus its harder for the motor to turn.
 
  • #3
but why this doesn't happen when you load using capacitive or inductive loads?
 
  • #4
eng_pro said:
but why this doesn't happen when you load using capacitive or inductive loads?

because capacitative and inductive loads don't have resistance, only reactance, they don't dissipate power
 

FAQ: Why a generator slow down with resistive loading?

Why does a generator slow down with resistive loading?

A generator slows down with resistive loading because resistive loads cause a decrease in the generator's output voltage. This decrease in voltage leads to a decrease in the generator's speed, which is directly proportional to the frequency of the output power.

How does resistive loading affect a generator's output voltage?

Resistive loading causes a decrease in a generator's output voltage because it creates a voltage drop across the resistive load. This voltage drop lowers the overall output voltage of the generator, resulting in a decrease in speed.

Can the generator's speed be maintained with resistive loading?

No, the generator's speed cannot be maintained with resistive loading. As the resistive load increases, the voltage drop across the load also increases, leading to a decrease in the generator's output voltage and speed. This decrease in speed is necessary to maintain a constant voltage and frequency output.

How does the type of resistive load affect a generator's speed?

The type of resistive load can affect a generator's speed differently depending on its characteristics. For example, a purely resistive load will cause a direct decrease in the generator's output voltage and speed. However, a load with both resistive and reactive components will cause a decrease in speed but may also affect the generator's power factor and result in additional losses.

Can a generator be overloaded with resistive loads?

No, a generator cannot be overloaded with resistive loads. As resistive loads do not cause an increase in the current drawn from the generator, it will not exceed its rated capacity. However, it is important to ensure that the resistive loads do not cause a decrease in the generator's speed beyond its acceptable limits.

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