4.2.4 Energy Transfers Flashcards
1
Q
If a lamp has an input of 100J of electrical energy and uses 25J on light how much is wasted and what type is wasted?
A
75J is wasted and is wasted on heat.
2
Q
What energy does a light bulb take in? What does it give out as wasted energy?
A
In - Electrical
Wasted - Heat
3
Q
Why is an old-style filament light bulb less efficient than an LED?
A
Transfers more energy as heat than light. LEDs give out very little heat.
4
Q
what energy does a torch take in?
what does it give out as wasted?
A
In - chemical
Wasted - heat
5
Q
What sort of energy does a motor take in?
What type of energy is useful?
What type of energy is wasted?wasted?
A
In - chemical
Useful - kinetic
Wasted - sound and heat
