Energy, Work And Power Vocab

Question 0

Efficiency (%)

Answer 0

= (useful energy output/energy input) x 100

Question 1

Energy

Answer 1

The ability to do work
An object may have energy due to it’s motion or position
Energy can be transferred or stored
Forms include: kinetic, gravitational potential, chemical (potential in bonds) eg. battery, nuclear (potential in nucleus), elastic/strain potential (stretched/compressed objects), thermal, light, sound, electrical/electrical potential, internal
Conserved

Question 2

Work done

Answer 2

= force (N) x distance travelled in direction of applied force (m) - Wd = fd =ΔE change in energy (energy transferred)
OR = mgh (mass kg x gravity x height m) - GPE
Joules (Nm) - 1J = 1N moves 1m

Question 3

Power

Answer 3

Watts
=E(energy J)/t(time s)
IW=1J/s=1Js to the -1
Rate of doing work (energy transfer)