if it takes 300 joules of work to move a piece of furniture 30 meters in 15 seconds, what is the power?

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.  

coil wire, increase current, put iron inside the coil