P5.4 Electrical currents and energy transfer Flashcards
1
Q
What is the equation for the flow of charge?
A
charge flow = current x time
2
Q
Why does a resistor becomes hot when a current is passed through it?
A
Each electron repeatedly collides with the vibrating metal ions of the resistor - transferring energy to the ions - so the ions of the resistor gain kinetic energy and vibrate even more - so becomes hotter
3
Q
What is the equation for energy transferred in a given time?
A
E = charge flow x potential difference E = power x time
