An electric bulb consumes 7.2 kJ of electrical energy in 2 minutes. What is the power of the electric bulb?
Text Solution
Verified by Experts
The correct Answer is:
60 W
We know that : `"Power" = ("Energy consumed")/("Time taken")` Here, Energy consumed = 7.2 kJ `= 7.2 xx 1000 J` = 7200 J And, Time taken = 2 minutes `= 2 xx 60` seconds = 120 s Now, putting these values of 'energy comsumed' and ' time taken' in the above formula, we get : `"Power" = (7200 J)/(120 s)` = 60 J/s = 60 W Thus, the power of this electric bulb is 60 watts.
LAKHMIR SINGH & MANJIT KAUR|Exercise Long Answer Type Questions|2 Videos
SOUND
LAKHMIR SINGH & MANJIT KAUR|Exercise Value Based Questions|20 Videos
Similar Questions
Explore conceptually related problems
An electric bulb converts electrical energy into
An electric bulb converts electric energy into heat energy.
An electric heater uses 600 kJ of electrical energy in 5 minutes. Calculate its power rating.
When an electric bulb glows
An electric bulb is connected to a 220 V generator. The current is 0.50 A . What is the power of the bulb ?
Define electric power. Derive an expression for power in terms of current and resistance. An electric bulb is connected to a 200 V generator. The current is 0.5 A. What is the power of the bulb?
An electric bulb consumes only 25% of the peak power in an a.c. circuit. What is the phase difference between the circuit and the applied a.c. voltage ?
An electric bulb converst _____ energy to ____ energy.
LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Multiple Choice Questions
