9. Work & Energy

What does the power rating on a light bulb describe?

A circuit dissipates a power $P_0$ when operating under certain conditions. If the circuit parameters are changed such that the voltage across it is doubled while the resistance remains the same, what is the new power dissipated by the circuit in terms of $P_0$?

A popcorn-maker transfers $250J$ of energy into other energy stores every second. What is its power?

Which statement best describes how power ratings are used to describe machines?

Which of the following units is equivalent to a $\mathrm{watt}$?

If you move an $8-\mathrm{newton}$ weight a distance of $5 \mathrm{meters}$ in $4 \mathrm{seconds}$, how much power have you generated?

What is the average power output of a weightlifter who lifts a $250$ kg mass to a height of $2.0$ m in $2.0$ s? (Assume $g=9.8$ m/$s^2$)

Which of the following equations correctly expresses power in terms of work and time?

Which of the following scenarios uses the most $\mathrm{power}$?

The power consumed by a load is measured in which of the following units?

Which of the following best defines power in physics?

Which of the following symbols represents $\mathrm{power}$?

Which of the following best describes the difference between energy and power?

An oil pump is drawing $44kW$ of power. Which of the following is the equivalent power in watts?

Which of the following best describes a power transmission device in physics?