Parallel and Series Circuits Flashcards
What happens when insulating materials are rubbed together?
Electrons are scraped off one and dumped on the other.
When a duster is rubbed on a polythene rod, which way do the electrons move?
From the duster to the rod.
With a Polythene rod, the duster becomes Positive
When a duster is rubbed on an acetate rod, which way do the electrons move?
From the rod to the duster.
What are positive static charges caused by?
Electrons moving away.
What are conductors?
Materials which charges can easily pass through.
How does resistance affect current?
The greater the resistance, the smaller the current.
What is current?
The rate of flow of charge.
What is current measured in?
Amperes (A)
What is the formula that connects charge, time and current?
Charge = Current / Time A = C / s
What is potential difference?
Work done per unit charge.
What is potential difference measured in?
Volts (V)
What is the formula that connects potential difference, charge and work done?
P.D = Work done / Charge V = J / C
Where can ammeters be placed?
Anywhere in series.
Where can voltmeters be placed?
In parallel across the component under test.
What do variable resistors control?
The current flowing through the circuit.
