A person in good physical condition can provide W of useful electrical power by doing mechanical work, neglecting any problems of generator efficiency and practical considerations such as resting time.
How many people would it take to run a 4.00-kW electric clothes dryer?
How many people would it take to replace a large electric power plant that generates 800 MW?
A device called an insolation meter is used to measure the intensity of sunlight. It has an area of 100 cm2 and registers 6.50 W. What is the intensity in W/m2?
The density of gold is 19.3 g/cm3. What is the density in kilograms per cubic meter?