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Energy Stores and Transfers (Slides).
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Energy Stores and Transfers (Slides)Define Energy.- ✅Energy is the ability to do work
What is the unit of energy?-✅Joule
What is the Energy flow diagram for a rocket?-✅Chemical energy→Kinetic
energy+ gravitational potential energy+ thermal energy+ light energy +
sound energy
✅
What is the Principle of Conservation of energy?- Energy cannot be
created or destroyed It can only be transferred from one form to another
Answer the question.- ✅1.0 x 105J
✅
Define efficiency.- Efficiency is the percentage of energy supplied that is
usefully transferred
✅Efficiency = useful energy output /
What is the equation for efficiency?-
total energy input x 100%
✅
When a filament lamp is supplied with 100J of energy, it produced 15J of
useful light. Find its efficiency.- 15%
A tidal-power station is expected to produce 32TJ of energy (1TJ=1012J )
✅
when the tides provide it with energy 100TJ of gravitational potential
energy. What is the efficiency of the power station?.- 32%
A tungsten-filament lamp is 4% efficient. How much electrical energy must
✅
be supplied to the lamp each second when it produce 6J of light per
second?- 150J
What is the Equation of Gravitational Potential Energy?- ✅g.p.e = mg x h
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