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प्रश्न
State the law that explains the heating effect of current with respect to the measurable properties in an electrical circuit.
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उत्तर
Joule's law of heating states that the heat dissipated across a resistor is directly proportional to:
- The square of the current flowing through it.
- The resistance of the conductor.
- Duration of the flow of current.
H = `"I"^2 "Rt"`
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संबंधित प्रश्न
Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?
Why does the connecting cord of an electric heater not glow hot while the heating element does?
An electric iron of resistance 20 ohms draws a current of 5 amperes. Calculate the heat produced in 30 seconds.
A heating coil has a resistance of 200 Ω. At what rate will heat be produced in it when a current of 2.5 A flows through it?
Give Scientific reason.
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Identify the figure and give its use.
Name any six domestic appliances based on the heating effect of electric current.
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| A | B | C | D |
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In a set up the students coated iron nails with zinc metal and noted that, iron nails coated with zinc prevents rusting. They also observed that zinc initially acts as a physical barrier, but an extra advantage of using zinc is that it continues to prevent rusting even if the layer of zinc is damaged. Name this process of rust prevention and give any two other methods to prevent rusting.
What is the heating effect of electric current?
