P5 - Electric Circuits Flashcards
Why do we use AC instead of DC for mains supply?
- It is easier to generate.
- It can be distributed more efficiently.
- Only AC can be used in a Transformer.
What is another name for Voltage?
Potential Difference.
A bulb has 3V going across it - how much energy does it use?
A bulb with 3V going across it takes 3J of energy from each unit of charge.
What gives moving charges energy?
The collision with vibrating ions in the wire.
Draw a Current-Voltage graph.
Only applies when a component’s resistance stays constant.
When components are connected in series…
- The current flowing through each component…
- The voltage across the components…
When components are connected in series…
- The current flowing through each component is the same.
- The voltage across the components adds up to the voltage of the battery.
When components are connected in parallel…
- The current flowing through each component…
- The voltage across the components…
When components are connected in series…
- The current flowing through each component splits and joins and depends on the resistance of each component.
- The voltage across the components is the same.
What causes the coil in an Electric Motor to spin?
The current travelling at a right angle to the magnetic field.
This causes a force that spins the coil.
A current that travels downwards would exert a force upwards.
What does it mean if something has a “current”?
It means it has a flow of charge.
A material that allows an electric current to pass through is called a(n) ________.
A material that does not allow an electric current to pass through is called a(n) _________.
A material that allows an electric current to pass through is called a conductor.
A material that does not allow an electric current to pass through is called an insulator.
When more batteries are added in series…
The voltage and current increase.
When more batteries are added in parallel…
The voltage and current remain the same but each battery suppleis less current.
