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Dependence of Resistance on Temperature

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A resistance coil of 60ohms is immersed in 42kg of water. A current of 7A is passed through it. The rise in temperature of water per minute is

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Q. A resistance coil of

60 Ω

42000 gm

of water. A current of

7 A

is passed through it. The rise in temperature of water per minute is (Specific heat of water

= 4200 {Jkg}^{- 1} K^{- 1}

)

Q. A resistance col of

60 Ω

is immersed in 42 kg of water. What is the rise in temperature of water per minute if a steady current of 7 A is made to flow through the coli?

Q. A heating coil is immersed in a calorimeter of heat capacity

50 J C^{- 1}

1.0

kg of a liquid of specific heat capacity

450 J K g^{- 1} C^{- 1}

. The temperature of liquid rises by

10^{o}

2.0

A current is passed for the

10

minutes. Find the resistance of the coil.

Q. A current of 2 A is passed through a coil of resistance

75 Ω

for 2 minutes. How much charge is passed through the resistance ?

Q. A coil which has a resistance of 4.2

Ω

is immersed into water. If 2A current is flowing through it for 10 min then how much heat will produce in calorie?

(< / = 4.2 J / c a l)

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