Electric Resistance Heating Formula

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Electric resistance heating formula.

This resistive heating is the result of friction as created by microscopic phenomena such as retarding forces and collisions involving the charge carriers usually electrons. The power p in watts w is equal to the voltage v in volts v times the current i in amps a. Electric resistance heat can be supplied by centralized forced air electric furnaces or by heaters in each room. Joule heating also known as resistive resistance or ohmic heating is the process by which the passage of an electric current through a conductor produces heat.

V v i a r ω. In formal terminology the heat corresponds to the work done by the charge. The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms ω. In electronics and electromagnetism the electrical resistance of an object is a measure of its opposition to the flow of electric current the reciprocal quantity is electrical conductance and is the ease with which an electric current passes electrical resistance shares some conceptual parallels with the notion of mechanical friction the si unit of electrical resistance is the ohm ω.

What is the relationship between electrical resistance and heat generated by a wire circuit or electrical device. Room heaters can consist of electric baseboard heaters electric wall heaters electric radiant heat or electric space heaters it is also possible to use electric thermal storage systems to avoid heating during times of peak power demand. Joule s first law also known as the joule lenz law states that the power of heating generated by an electrical conductor is proportional to the product of its resistance and the square of the current. The heat generated due to the flow of current is proportional to the time of current flowing when the electrical resistance and the amount of current is constant.

This article uses an older honeywell t87 type thermostat heat anticipator device to explain the relatinship between electrical resistance and heat generated by a wire when current flows through it. Installing electric baseboard heating is often the easiest and most effective way to add heating to a room addition or when you are converting an unheated space such as an attic or basement ideally it s always best to extend existing ductwork from your central furnace air conditioning system but sometimes it s just not possible to route additional ductwork.