Power and Efficiency(5.4)

Question 1

What is power?

Answer 1

Power is the rate of work done/energy transferred

Question 2

What is the equation for power?

Answer 2

Power = Work done / time

Question 3

How do you calculate the rate of work done against gravity?

Answer 3

~The rate of work done against gravity is essentially a power equation where you have substituted work done with the equation for gravitational potential energy~
Power = (mass(Kg) x gravitational field strength(NKg^-1) x height(m)) / time(s)

Question 4

How do you calculate the power of an object moving at a constant velocity?

Answer 4

Power = Work done / time
~substitute the equation for work done in the power equation~
Power = (Force x distance moved) / time
~The speed of an object is (x / t)~
Power = Force x velocity

Question 5

What is efficiency?

Answer 5

Efficiency is the percentage of useful energy/work that is produced from the energy inputed

Question 6

What is the equation for efficiency?

Answer 6

efficiency(%) = (useful output energy) / (total input energy) x 100