Charge, current and power Flashcards
1
Q
What is a Sankey Diagram?
A
A diagram using arrows to show the different amounts of energy transformed in different forms.
2
Q
Why are energy-saving light bulbs better than filament bulbs?
A
Filament bulbs emit only 10J of light energy and 90J of heat energy per 100 Joules, however, energy-saving bulbs emit 75J of light energy and 25J of heat energy per 100 Joules.
3
Q
How do you calculate power (give the equation)?
A
P = E ÷ t
P= Power (W) E= Energy transferred (J) t= time (s)
4
Q
What is the current?
A
When you move electrical charges eg. electrons moving through a metal wire.
