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An electric current of 2.0 A passes thro...

An electric current of `2.0` A passes through a wire of resistance `25 Omega`. How much heat will be developed in 1 minute?

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The correct Answer is:
A, C
`I = 2 A, R = 25 Omega`
`t = 1 min = 60 sec`
` Heat developed = i^2 Rt `
`= (2xx 2 xx 25 xx 60 ) `
`=100xx60J = 6000 J`
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HC VERMA-THERMAL AND CHEMICAL EFFECT OF ELECTRIC CURRENT-Exercise
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  2. A coil of resistance 100 Omega is connected across a battery of emf 6....

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  3. The specification on a heater coil is 250 V, 500 W. Calculate the resi...

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  4. A heater coil is to be constructed with a nichrome wire (rho = 1.0 xx ...

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  7. A servo voltage stabiliser restricts the voltage output to 220 V +- 1%...

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  8. An electric bulb marked 220 V, 100 W will get fused if it is made to c...

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  9. An immersion heater rated 1000 W, 220 V is used to heat 0.01 m^3 of wa...

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  10. An electric kettle used to prepare tea, takes 2 minutes to boil 4 cups...

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  11. The coil of an electric bulb takes 40 watts to start glowing. If more ...

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  12. The 2.0 Omega resistor show in figure is dipped into a calorimeter con...

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  13. The temperatures of the junctions of a bismuth-silver thermocouple are...

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  14. Find the thermo-emf developed in a copper-silver thermocopule when the...

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  17. Find the amount of silver liberated at cathode if 0.500 A of current i...

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  18. An electroplating unit plates 3.0 g of silver on a brass plate in 3.0 ...

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  19. Find the time requried to liberate 1.0 litre of hydrogen at STP in an...

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