Hello friends in this article we will know that Electric current What is the heating effect of Electric Current? What is Nichrome? And learn about many facts related to it.
Thermal effect of electric current. Heating effect of Electric Current
When an electric current (ie the flow of free electrons) passes through a conductor, there is considerable ‘friction’ between the moving electrons and the molecules of the conductor. To overcome this ‘electrical friction’ (what we refer to as electrical resistance) electrical energy is converted into heat. This “Heating effect of electric current” known as.
Example :- If I ampere is flowing through a conductor of resistance R ohm for t seconds, then the electrical energy supplied is I²Rt joules. This energy is not lost, but the entire I²Rt is converted into joules of heat. meaning
Heat production, H = I²Rt joules = I²Rt / 4.186 calories
The heating effect of electric current is used in the manufacture of many heating devices such as electric heaters, electric toasters, electric kettles, soldering irons, etc. The basic principle of all these devices is the same.
Electric current is passed through a high resistance (called a heating element), thus generating the necessary heat. Many substances are used to make heating elements. One commonly used is an alloy of nickel and chromium, known as “nichrome” is called.
The resistance of this alloy is more than 50 times that of copper. The heating element may be ribbon wound on either nichrome wire or some insulating material that is able to withstand the heat.
To deal with problems on heating appliances, the following points may be kept in mind:-
The electrical energy in kWh can be converted into joules by the following relation:
1 kWh = 36 × 10⁵ joules
The heat energy in calories can be converted into joules by the following relation:
1 calorie = 4.186 joules
1 kcal = 4186 joules
The electrical energy in kWh can be converted to calories (or kilocalories) by the following relation:
1 kWh = 36 × 10⁵ joules
= 36 × 10⁵ / 4.186 calories = 860 × 10 Calories
So, 1 kWh = 860 kcal
The electrical energy supplied to the heating equipment forms the input energy. The heat received from the device is the output energy. The difference between the two, if any, represents the loss of energy during the conversion from electrical to thermal energy.