Example of electrical computation formulas for electrical calculation involving the function and operation of DC motors

Example 1: The field winding of a shunt DC (Direct Current) motor has a resistance of 110 ohms, and the emf (electro-motive force) applied to it is 220 volts. What is the amount of power expended in the field excitation?

B/W Floatless Liquid Level Detection Induction Control Relay Switch

While liquid level detection float devices applies the practical approach of utilizing the principle of buoyancy which depends mainly on a floating object to detect the liquid level in a reservoir that mechanically actuates a switching mechanism to manipulate an electrical switch output to control a water pump, a floatless counterpart which does not rely on mechanical float mechanism makes use of metallic rods immersed in the liquid which serves as electrode probes to detect the depth of the liquid level in the reservoir.

Using Micro Switch for Mechanically Actuated Water Level Detection Float Switch

Another type of float switch for liquid level control and detection incorporates the use of the micro switch for its main electrical component. Unlike the mercury switch which is dependent on turning the position of the glass vial to cause the liquid mercury to fall by gravity to immerse its electrical contacts to provide a switch output, the micro switch is an electrical switching device fitted with both open and close contacts which is mechanically actuated to provide both open and close electrical switching output states via a pin button accessible on the upright side of its outer casing.

Mechanically Actuated Water Level Detection Float Ball Switch with Mercury Switch

The use of float balls as a component part of a liquid level detection device to mechanically actuate a switching mechanism such as a mercury switch or a micro switch is an effective and economical method of controlling liquid level in liquid tanks or any liquid reservoir. Float level switch is not only simple and convenient in terms of its concept and adaptability in various applications due to its uncomplicated and easy to understand principle but is also cheaper than its more advanced opposite counterpart most commonly known as the floatless liquid level controllers.

Guide to the Power Circuit and Control Circuit of the Wound Rotor AC Induction Motor

In certain exceedingly enormous type of industrial applications where a tremendous amount of power is required to drive a specific type of load too large for the ordinary type squirrel cage induction motors to carry, the most appropriately preferred type of motor for use with such extensively large demand of power application is another type of large capacity motor which has the capability to run with high starting torque immediately attainable all throughout starting from when the motor is just beginning to run from rest even while it is at loaded condition up to when the motor reaches its peak rated speed while also carrying the same amount of heavy load, which would also necessitate for this type of motor to possess the ability to run continuously at different variation of steps of speed levels while driving a very heavy load. This type of motor is known as the wound rotor induction motor.