Electricity YEAR 10 Flashcards
Unit of charge (Q)
Coulombs
What does Q = IT mean
Charge = current x time
Does a thin or thick wire have higher resistance and why
Thin wire has more resistance because it has fewer gaps for the free electrons to pass through.
Describe an experiment to determine the relationship between a wires length and its resistance
Attach wire to 1m ruler
Set up circuit where volts and amps are tested when current is supplied
Test volts and amps at 1m length
Then move the wire along the 1m wire to vary the distance of the wire
Different between series and parallel circuits
Series - All components connected end to end in a single path
Parallel - each component has its own separate branch and the same voltage is applied to each component.
Does a long or short wire have more resistance
Long wire has more resistance
Why does a higher temperature make metals have a higher resistance
If the temperature of a metal conductor increases, the ions of the metal vibrate more vigorously, which resists the flow of electrons
How is current spread in a series circuit
It is the same in every component
How is pd spread across components in series circuits
the total pd is shared across the components
How is current spread in parallel circuits
current splits into different branches then combines again before it goes back into the supply
How is pd spread in parallel circuits
PD across each branch is the same
How is resistance spread in a series circuit
the total resistance of the circuit is the sum of individual resistors
How is resistance spread in a parallel circuit
1/Total resistance =
1/Components Resistance + 1/Component Resistance + etc
Diode
Makes current flow 1 directional
Thermistor
Varies resistance based on temperature
