P7 Electricity Flashcards
(31 cards)
How many loops are in a series circuit
One
Describe the current in a series circuit
It is the same throughout the loop
What happens to the potential difference from a power source in a series circuit
It is shared between the components
How many loops are in a parallel circuit
Two or more
Do the loops of a parallel circuit affect one another
No - each loop of a parallel circuit is independent
What is an electrical insulator
A material with no charges that are free to move
Give three examples of an electrical insulator
Wood
Plastic
Air
What is an electrical conductor
A material that has charges that are free to move
Give a family of materials that are electrical conductors
Metals
What are the charges that are free to move in a metal
Electrons
How do we count electrons
By their charge, in coulombs (C)
What do we call a closed loop that can carry electricity
A complete circuit
Name two types of power supply
Electrical cell/ battery. Mains power
What is a battery
Two or more cells connected together (in series)
What Do we call charges moving in a circuit
An electrical current
What is the relationship between the speed of charges and the current
The faster the charges move, the higher the current
What is current
The rate of flow of charge
What unit do we use to measure current
Amps, A
What piece of equipment is used to measure current in a circuit
Ammeter
How are ammeters connected in a circuit
As part of the circuit (in series)
What is needed to make current flow
A power supply and a complete circuit
What does 1A reperesent
One coulomb of charge passing a point per second
Where do charges in a circuit get their energy from
A power supply
What term is used to describe the amount of energy transferred per coulomb between two points in a circuit
Potential difference (p.d.)
