Electricity Flashcards
What is it called when electrons rub off one material, and are deposited on another?
Static electricity.
How is charge gained by static?
The process is called charging by friction, giving or taking electrons.
What does a charged object create?
An electric field.
What does the second charged object experience?
A non-contact force.
What happens at a greater distance between two objects?
The static force becomes weaker.
How can current be described using charge?
Current is the rate of flow of electric charge.
What happens to current in a series circuit?
It stays the same.
What does a diode do?
Allow current to only flow in one direction.
What is the name of a component where current is directly proportional to the potential difference? What is the law called?
An ohmic conductor. Ohms law.
What happens to a current-p.d graph when resistance is increased?
It becomes less steep.
What does the line look like for a filament lamp?
A curve in a wave-like shape.
What happens to the resistance of a filament lamp when current increases? Why?
It also increases because the resistance increases as its temperature increases.
What is resistance the same for, regardless of direction?
The same size current.
How does a diode allow current in one direction only?
Because the other direction has a very high resistance, making the current through it virtually zero.
When does an LED emit light?
When current passes through it in the forward direction.
