Heating Effect of Electricity and Joule law
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Transcript of Heating Effect of Electricity and Joule law
![Page 1: Heating Effect of Electricity and Joule law](https://reader036.fdocuments.in/reader036/viewer/2022082514/55a9f8911a28aba55d8b46c7/html5/thumbnails/1.jpg)
< <Heating Effect of
Electricity
![Page 2: Heating Effect of Electricity and Joule law](https://reader036.fdocuments.in/reader036/viewer/2022082514/55a9f8911a28aba55d8b46c7/html5/thumbnails/2.jpg)
< <
Why 100W bulb produces more heat than CFL?
Electric Power(W) = Voltage(V) x Current(I)
100W30W10W
![Page 3: Heating Effect of Electricity and Joule law](https://reader036.fdocuments.in/reader036/viewer/2022082514/55a9f8911a28aba55d8b46c7/html5/thumbnails/3.jpg)
< < Electric Power(W) = Voltage(V) x Current(I)
Why 100W bulb produces more heat than CFL?
More power means as more current required
![Page 4: Heating Effect of Electricity and Joule law](https://reader036.fdocuments.in/reader036/viewer/2022082514/55a9f8911a28aba55d8b46c7/html5/thumbnails/4.jpg)
< < Q I2
Heat produced is directly proportional to the square of electric current. So, electric current means more heat.
Produced heat
Current flow
![Page 5: Heating Effect of Electricity and Joule law](https://reader036.fdocuments.in/reader036/viewer/2022082514/55a9f8911a28aba55d8b46c7/html5/thumbnails/5.jpg)
< < Q I2
Produced heat
Current flow
Assuming Resistance is unchanged
![Page 6: Heating Effect of Electricity and Joule law](https://reader036.fdocuments.in/reader036/viewer/2022082514/55a9f8911a28aba55d8b46c7/html5/thumbnails/6.jpg)
< <
Electric Power(W) = Voltage(V) x Current(I)
Why 100W bulb produces more heat than CFL?
More current means more heat
Q I2
![Page 7: Heating Effect of Electricity and Joule law](https://reader036.fdocuments.in/reader036/viewer/2022082514/55a9f8911a28aba55d8b46c7/html5/thumbnails/7.jpg)
< < Q/I2 = constant
Q I2
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< < Q/I2 = constant
I is doubled Q/(2I)2 = constant
![Page 9: Heating Effect of Electricity and Joule law](https://reader036.fdocuments.in/reader036/viewer/2022082514/55a9f8911a28aba55d8b46c7/html5/thumbnails/9.jpg)
< < Q/I2 = constant
I is doubled Q/(2I)2 = constant
Q =4I2xconstantQ would increase 4 times
![Page 10: Heating Effect of Electricity and Joule law](https://reader036.fdocuments.in/reader036/viewer/2022082514/55a9f8911a28aba55d8b46c7/html5/thumbnails/10.jpg)
Q R
Resistance of conductor
More resistance means more heat
High resistance material
![Page 11: Heating Effect of Electricity and Joule law](https://reader036.fdocuments.in/reader036/viewer/2022082514/55a9f8911a28aba55d8b46c7/html5/thumbnails/11.jpg)
Q R
More resistance means more heat
High resistance material
Heat produced is directly proportional to resistance of
conductor
Q R
Resistance of conductor
![Page 12: Heating Effect of Electricity and Joule law](https://reader036.fdocuments.in/reader036/viewer/2022082514/55a9f8911a28aba55d8b46c7/html5/thumbnails/12.jpg)
Q R
More resistance means more heat
High resistance material
Heat produced is directly proportional to resistance of
conductor
Q R
Resistance of conductor
Assuming current is unchanged
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Q I2 R
Joule heating
Nichrome with high R and high current (I) produces
heat in this heater
Nichrome coil