What does it mean when a resistor has low resistance?
A conductor has low resistance, while an insulator has much higher resistance. Devices called resistors let us introduce precisely controlled amounts of resistance into electrical circuits.
What happens if a resistor is too low?
If resistance is too low, current will be high at any voltage. If resistance is too high, current will be low if voltage is okay. NOTE: When the voltage stays the same, such as in an Automotive Circuit… current goes up as resistance goes down, and current goes down as resistance goes up.
Why do you need a current limiting resistor on a led?
For example, adding a current limiting resistor at one end of the LED can reduce the current flowing through the LED and prevent damage to the LED lamp. In terms of the basic process of rectification and filtering, the low voltage and the high voltage are the same.
What is the effect of inductance on a resistor?
All real resistors exhibit parasitic inductance to a greater or lesser extent, depending on the design and construction of the resistor. Parasitic inductances in an AC circuit can cause unwanted couplings between system blocks or can be the cause of an altered circuit response at high frequencies.
Why is inductive reactance used in current limiting reactors?
The inductive reactance is chosen to be low enough for an acceptable voltage drop during normal operation, but high enough to restrict a short circuit to the rating of the switchgear. The amount of protection that a current limiting reactor offers depends upon the percentage increase in impedance that it provides for the system.
How are ideal resistors and ideal inductors different?
The main difference between ideal resistors and ideal inductors is therefore that resistors dissipate electrical power as heat, while inductors turn electrical power into a magnetic field. Ideal resistors have zero reactance and as a result zero inductance.