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What else can I help you with?
In the potentiometer resistance increases gradually then why fan speed increases?
Hope this doesn't shock you ... the high-speed (or high-radio-volume) end of the potentiometercan very well be the low-resistance end. It's wired in such a way that as you turn the knob fromleft to right, the resistance decreases gradually.
Why does a parachutist not accelerate as he falls?
You do, with a speed of 9.81m/s2 (Ignoring air resistance). When the parachute opens, the air resistance becomes very high, and so you decelerate to a certain speed (depending many different factors like air pressure and height.).
Do Dead batteries have high internal resistance?
yes, batteries have high internal resistance. The higher the resistance the lower power you get out of the batter. Therefore if you no power you have very high resistance.
Which has a higher resistance insulators or conductors?
No, the resistance of an insulator is very high.
An open circuit has an infinate resistance?
There is no such a thing as infinite resistance but it could be a very high resistance.
Is there any very high resistance compound of Cobalt and Silicon.?
no
Why is tungsten used for high-speed drill bits?
Tungsten is used for high-speed drill bits because it is a very hard and dense metal that can withstand the high temperatures and stresses generated during drilling at high speeds. Its high thermal conductivity helps dissipate heat efficiently, and its wear resistance ensures long-lasting performance.
Why resistance is high during short circuiting?
Resistance of a short circuit is actually very low, ideally it is 0 Ohms. In practice the resistance of a short circuit will be equal to whatever the resistance of the short circuited wires is, which is typically very small. So if you substitute very small resistance value R into Ohm's Law(I = V/R), you will get a very high current flowing. Where V=voltage,I=current.
How speed of the repulsion motor can be reversed?
it has very high speed but no load
How do you identify the polarity of a diode when the tester is on resistance scale?
ln reverse biase high resistance and in forward biase very low resistance
What type of resistance does a good insulator provide?
A perfect insulator (which does not really exist) would have an infinitely high resistance. Good insulators provide very high resistance to current flow, on the order of tens of megohms and up.
How liquid rotor resistance operate?
Re: Liquid Rotor Starter A variant of the induction motor, is the slip ring, or wound rotor motor. The induction motor has a "squirrel cage" rotor which is in effect a short circuited winding in the rotor. The start and run characteristics are influenced by the resistance and inductance of the rotor circuit. One of the problems of the induction motor, is that the start current is very high (600 - 900%) and the start torque is relatively low (120 - 200%) compared to the start current drawn. The induction motor has a speed at which maximum torque is produced and this is very close to full speed. By altering the resistance in the rotor design, we can alter the speed at which maximum torque is produced. Below this speed, the current goes high and the torque goes down. Above this speed, the current drops with the torque. The wound rotor motor, has a winding on the rotor that is not short circuited, but is brought out to slip rings. This enables the effective rotor resistance to be altered. By varying the rotor resistance while the motor starts, we can cause the speed of maximum torque to shift from zero speed up to very close to full speed in a number of steps. The big advantage of this, is that the motor is able to provide a high start torque (around 200%) and a low start current (around 200%) from zero speed to full speed. This is very god for starting high inertia and difficult start loads on relatively weak supplies. The rotor resistors can be cast resistors, wound resistors, or liquid resistors. With standard resistors, the stages are switched in and out by contactors to alter the resistance. With liquid resistors, the resistance can be varied by varying the immersion of probes in the electrolyte. This can be achieved by raising and lowering the probes, or the liquid level.
