Time taken by a 836 W heater to heat one...

Time taken by a 836 W heater to heat one litre of water from `10^@C to 40^@C` is

50 s

100 s

150 s

200 s

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An immersion heater is rated 836 watt . It should heat 1 litre of water from 10^(@)C to 40^(@)C in about

An immersion heater is rated 836 watt. In what time, it should heat 1 litre of water from 20^@C to 40^@C ? J = 4.18 J//cal .

The heater coil of an electric kettle is rated as 2000W at 200V. How much time will it take to heat one litre of water from 20^(@)C to 100^(@)C assming that entire electric energy liberated form the heater coil is utilised for heating water? Also calculate the resistance of the coil. Density of water is 1g cm^(-3) .

The heater coil of an elecric kettle is rated at 2000W,200V, How much time will in take is rasing the temperature of 1 litres of water from 20^(@)C to 100^(@)C . Assuming that only 80% of the total heat energy produced by the heater coil is used in raising the temperature of water. Density of water heater coil is used in raising the temperture of water. density of water = 1g cm^(-3) and specific heat of water = 1 "cal" g^(-1) .^(@)C^(-1) .

(i). Find the time taken by a filament of 200 W to heat 500 ml of water from 25^(@) C to 75 ^(@) C . Specific heat of water is 1 calg^(-1@) C^(-1) . Take 1 cal = 4.2 J . (ii) Find the power produced by each resistor shown in Fig. 7.17 . If R_(1) is dipped in 1000 ml of water at 30^(@) C , find the time taken by it to boil the water.

An immersion heater rated 1000 W, 220 V is used to heat 0.01 m^3 of water. Assuming that the power is supplied at 220 V and 60% of the power supplied is used to heat the water, how long will it take to increase the temperature of the water from 15^@ C to 40^@ C ?

NCERT FINGERTIPS-PRACTICE PAPERS-Practice Paper 3

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