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P2 (Resistance (you can investigate factors affecting resistance (to do…
P2
Resistance
you can investigate factors affecting resistance
to do this you need to incoporate a voltmeter or an ammeter
volts=current x resistance
Current and circuit symbols
Current is the flow of electrical charge
Electric charge will only flow round a complete closed circuit if there is a potential difference
PD or voltage is the driving force that pushes the charge round
Total charge depends on current and the time
more charge passes round when there is a bigger current
charge=current x time
circuit symbols
series and parallel
parallel circuit
series circuits
Resistance adds up
potential difference shared and the current is the same
v1+v2
I1=I2
