Equations

What is the equation for kinetic energy?

KE = ½mv²

What does kinetic energy depend on?

Mass and velocity squared.

What is the equation for gravitational potential energy?

GPE = mgh

What does gravitational potential energy depend on?

Mass, gravitational field strength and height.

What is the equation for elastic potential energy?

Ee = ½ke²

What is the equation for work done?

W = Fs

What does work done represent?

Energy transferred when a force moves an object through a distance.

What is power?

The rate of energy transfer.

What is the equation for power?

P = E/t

What other equation can calculate power?

P = W/t

What equation links energy, power and time?

E = Pt

What is the equation for gravitational field strength?

g = W/m

What is the approximate value of g on Earth?

9.8 N/kg, often approximated to 10 N/kg.

What is efficiency?

Useful energy output divided by total energy input.

What is the percentage efficiency equation?

Efficiency = useful output ÷ total input × 100

What is 1 kWh in joules?

3.6 × 10⁶ J.

How is energy in kWh calculated?

Energy = power in kW × time in hours.