Find the energy in $kWh$ consumed in $10$ hours by four devices of power $500\, W$ each. (in $kWh$)

$A$ lamp consumes $1000\, J$ of electrical energy in $10\, s$. What is its power (in $, W$)?

$A$ force of $10\, N$ moves a body with a constant speed of $2\, m s^{-1}$. Calculate the power of the body.

State whether the following statement is true or false:
The unit of work is watt.

Define watt. Express kilowatt in terms of joule per second. $A$ $150 \, kg$ car engine develops $500 \, W$ for each $kg$. What force does it exert in moving the car at a speed of $20 \, m \, s^{-1}$ (in $N$)?

Which one of the following is not the unit of energy?