Advertisements
Advertisements
Question
How much electrical energy in joules does a 100 watt lamp consume : in 1 second?
Advertisements
Solution
Power of the lamp, (P) = 100 W
(a) Time, (t) = 1 s
Now, we can calculate the electrical energy consumed as:
Energy consumed = Power × Time
So,
Energy consumed = 100 × 1 J
= 100 J
So, the energy consumed is 100 J.
APPEARS IN
RELATED QUESTIONS
A ball of mass 0.20 kg is thrown vertically upwards with an initial velocity of 20 m s-1. Calculate the maximum potential energy it gains as it goes up.
What kind of energy is possessed by the following?
A stretched rubber band _____________
A boy weighing 40 kg makes a high jump of 1.5 m.
What is his potential energy at the highest point? (g = 10 m/s2)
Name the device which converts electrical energy into mechanical energy.
Name the device or machine which convert :
Mechanical energy into electrical energy.
Fill in the blanks with suitable words:
When a ball is thrown upwards, ___________ energy is transformed into ___________ energy.
What do you understand by the term 'transformation of energy"? Explain with an example.
Name the energy transfers which occur when a torch is on.
When an object falls freely towards the earth, then its total energy :
An object is falling freely from a height x. After it has fallen a height `pi/2` , it will possess :
