electrical circuits
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what is electric current
electric current is the flow of charge around a circuit
when can electric current flow
When it is complete
are moving charges positive protons or negative electrons
negative electrons
to what direction does the charges flow towards
the opposite to the conventional current which goes from a positive to negative
Is current used up?
No
complete the sentence The …… current in the circuit is always the ……
The total current in the circuit is always the same
what is potential difference
a driving force
what is the driving force?
the potential difference
what does the battery do?
it provides the driving force to push the charge round the circuit.
what’s one way you can you get more current to flow
increasing the potential difference
How can you make the potential difference bigger?
Putting several batteries together
What is resistance?
anything in a circuit that slows down the flow of current
What resistance measured in?
ohms (Ω)
give the formula in order to find the resistance of a component?
Resistance = potential difference ÷ current
complete the sentence As long as the potential difference is the ………, the ……….. the resistance of a component, the ………. the current through it.
As long as the potential difference is the same, the higher resistance of a component, the smaller the current through it
what are components and materials that electricity can easily travel through called
conductors
What are components and materials that don’t easily allow electric charges to pass through them called?
insulators
how can you make a component better at conducting electricity?
making the resistance lower