Power

The video explains that performing a given amount of work in a shorter time requires more power, although the energy needed remains constant. Power is measured in watts, which are equivalent to joules per second.

What happens to the power required if the same amount of work is done in a shorter time?

• The power required decreases.

• The power required becomes zero.

• The power required remains the same.

• The power required increases.

If you push a weight up a slope more quickly, what changes in terms of power and energy?

• More energy is required, but power remains the same.

• More power is required, but energy remains the same.

• Both power and energy required increase.

• Both power and energy required decrease.

In which units is power measured in the SI system?

• Joules

• Newtons

• Watts

• Volts

What is the equivalent of one watt in terms of energy per time?

• One newton per second

• One joule per second

• One volt per second

• One joule per minute

Which of the following statements is true about power and energy?

• Power is the rate at which energy is used.

• Power is measured in joules.

• Power and energy are the same.

• Energy is the rate at which power is used.