An 850 W consumer coffee maker can make 10 cups (1.75 litres) of `80^(@)C` coffee from `20^(@)C` tap water in 10 minutes. What percentage of the electrical energy consumed actually makes it to the coffee?

An incandescent lamp consumint P=54W is immersed into a transparent calorimeter containing V=10^3cm^3 of water in 420 s the water is heated by 4^@C . The percentage of the energy consumed by the lamp that passes out of the calorimeter in the form of radiant energy is

An incandescent lamp consumint P=54W is immersed into a transparent calorimeter containing V=10^3cm^3 of water in 420 s the water is heated by 4^@C . The percentage of the energy consumed by the lamp that passes out of the calorimeter in the form of radiant energy is

A copper electrical kettle weighing 1 kg contians 0.5 kg of water at 20@C . It takes 10 minutes to raise the temperature to 100^@C . If the electric energy is supplied at 220V, calculate the strength of the current,assuming that 20% heat is washed. Specific heat of copper is 0.1.

A copper electric kettle weighing 1000 g contains 900g of water at 20^(@)C it takes 12 minutes to raise the temperature to 100^(@)C . If electric energy is supplied at 210V, calculate the strength of the current, assuming that 10% heat is wasted. Specific heat of copper is 0.1.

A copper electric kettle weighing 1000 g contains 900g of water at 20^(@)C it takes 12 minutes to raise the temperature to 100^(@)C . If electric energy is supplied at 210V, calculate the strength of the current, assuming that 10% heat is wasted. Specific heat of copper is 0.1.

A cup of coffee at temperature 100^(@)C is placed in a room whose temperature is 20^(@)C and it costs to 60^(@)C in 10 minutes find the temperature after a further interval of 10 minutes .

Time taken by a 836 W heater to heat 1 litre of water from 10^@C to 40^@C is

An electric kettle taking 3 A "at" 210 V brings 1 L of water from 20^(@) C to 80^(@) C "in" 10 min . Find its efficiency.

An electric kettle taking 3 A "at" 210 V brings 1 L of water from 20^(@) C to 80^(@) C "in" 10 min . Find its efficiency.