In Class 10 Science (Electricity), we learn that when an electric current passes through a high-resistance wire, the wire gets hot. This phenomenon is called the Heating Effect of Electric Current.
Principle: Electrical energy converts to Heat energy due to resistance.
Joule's Formula: H = I²Rt.
Common Alloy used: Nichrome (because it has high resistance and doesn't melt easily).
Application: Irons, heaters, toasters, and fuses.
When electrons flow through a conductor (like a wire), they constantly collide with the atoms of the wire. These collisions create friction/resistance. To maintain the flow of current against this resistance, the electrical energy from the battery is continuously converted into heat energy.
James Prescott Joule formulated a law to calculate exactly how much heat is produced. The heat produced (H) in a resistor is:
Formula: H = I²Rt (Where H is Heat in Joules, I is Current in Amperes, R is Resistance in Ohms, and t is time in seconds).
We intentionally use high-resistance alloys (like Nichrome) to generate heat in daily appliances:
When an electric current is passed through a high-resistance wire, the wire becomes hot and produces heat. This is known as the heating effect of electric current.
The formula is H = I²Rt, meaning heat produced is equal to the square of the current, multiplied by the resistance, multiplied by the time.
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