Understanding Power in Physics

What is the definition of power in the context of physics?

• The amount of energy stored in an object

• The rate at which work is done

• The total work done over a period

• The speed at which an object moves

If a light bulb has a power rating of 25 watts, what does this mean?

• It converts 25 joules of energy into light every second

• It uses 25 joules of energy every minute

• It stores 25 joules of energy

• It requires 25 joules of energy to turn on

In the example with two light bulbs, which one is more powerful?

• Neither, they are both inefficient

• Both have the same power

• Light bulb 2 with 40 watts

• Light bulb 1 with 60 watts

How much power is exerted by the car's brakes if 10,000 joules of work is done in 4 seconds?

• 2,500 watts

• 3,000 watts

• 2,000 watts

• 4,000 watts

What is the power output when Jack and Jill exert 100 joules of work in 10 seconds?

• 20 watts

• 10 watts

• 5 watts

• 15 watts