P1.2 Using Energy Flashcards
1
Q
give three examples of energy forms.
A
- Kinetic
- nuclear
- electrical
- gravitational potential
- elastic potential
- chemical
2
Q
give two examples of stored energy
A
- chemical
- gravitational potential
- elastic potential
3
Q
where does the chemical energy stored in your muscles come from?
A
the food you eat
4
Q
What is the conservation of energy?
A
energy cannot be created or destroyed.
5
Q
what energy changes does conservation apply to?
A
all energy changes
6
Q
What is ‘Useful Energy’?
A
energy in the place and form that we need it
7
Q
what is ‘Wasted Energy’?
A
Energy that is not usefully transferred
8
Q
what happens to the wasted energy in a light bulb?
A
It is transferred to the surroundings which get hotter.
9
Q
What is energy measured in?
A
Joules (J)
10
Q
What is the equation for efficiency?
A
(useful energy/total energy)x100%
11
Q
name three measures that make machines more efficient when reduced.
A
- friction
- air resistance
- electrical resistance
- noise due to vibrations.
