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Electric devices like laundry iron, electric toaster, electric oven, electric kettle and electric heater are based on which effect of electric current?
Chemical effect
Magnetic effect
Physiological effect
Heating effect
Heating effect
Electric devices like laundry irons, toasters, ovens, kettles, and heaters operate on the heating effect of electric current, also known as Joule heating. When an electric current flows through a high-resistance conductor (such as nichrome wire), electrical energy is converted into thermal (heat) energy.
Electric devices like laundry irons, toasters, ovens, kettles, and heaters operate on the heating effect of electric current, also known as Joule heating. When an electric current flows through a high-resistance conductor (such as nichrome wire), electrical energy is converted into thermal (heat) energy.
When you rub your hands together rapidly on a cold day, friction converts your mechanical energy into thermal energy, making your hands warm. Similarly, as electrical charges 'rub' against the high resistance of a heating element, electrical energy is converted into heat.
Remember 'Joule's Hot Iron': J-H-I stands for Joule Heating in Irons and Heaters.
H=I2Rt тАФ Joule's law of heating (Heat produced)
P=V├ЧI=I2R=RV2тАЛ тАФ Electrical power formula
According to Joule's law of heating, the amount of heat (H) produced in a resistor of resistance R when a current I flows through it for a time t is given by H=I2Rt. In appliances like heaters and irons, heating elements made of high-resistance alloys like nichrome (nickel-chromium alloy) get very hot without melting or oxidizing at high temperatures when current passes through them.
Nichrome (an alloy of Nickel, Chromium, Iron, and Manganese) is used as the heating element.
Nichrome has high electrical resistivity and does not oxidize easily at high temperatures.
The heating effect is independent of the direction of current (depends on I2).
Used in appliances like electric iron, water heater, room heater, toaster, and hair dryer.
Provides quick and clean heat.
Easy to control and regulate using thermostats.
Involves significant energy loss in the form of unwanted heat if not insulated properly.
High electricity consumption compared to mechanical work.
Domestic heating appliances (iron, toaster, immersion rod, room heater)
Incandescent electric light bulbs (filament heating)
Fuses used for electrical safety in households
Option A (Chemical effect): Used in electroplating, charging batteries, and electrolysis.
Option B (Magnetic effect): Used in electric motors, electromagnets, and generators (Faraday's law/Oersted experiment).
Option C (Physiological effect): Refers to the effect of current on living tissues (nerve stimulation, electric shock).
D is correct тАФ Electric devices like laundry iron, toaster, oven, kettle, and heater are based on the heating effect of electric current (Joule heating).
Always remember that heating elements in household appliances are made of Nichrome, whereas bulb filaments are made of Tungsten due to its extremely high melting point (3422┬░C).
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