Current Electricity - AQA GCSE Physics Additional

Revision Notes on currents, series + parallel circuits, components in circuits and resistance.

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  • Created on: 04-01-12 16:46
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Current Electricity:
A circuit diagram is a useful way to show how components make
up a circuit. Each component has its on symbol and use.
Name Symbol Use
Battery Pushes electrons around a
completed circuit.
Switch Enables current to be
switched on or off
Light Designed to emit light as a
signal when current passes
Resistor Limits current in a circuit
Variable resistor Allows current to be varied
Fuse Designed to melt if the
current is greater than a
certain amount and break
the circuit.
Thermistor Resistance goes down when
the temperature goes up.
Diode Allows current through in
one direction only.
LED Emits light
LDR Resistance goes down when
light increases.
Voltmeter Used to measure potential
Ammeter Used to measure electrical
A Circuit Diagram:

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Electrons passing through a circuit have to push their way through
lots of vibrating atoms which resist the passage of electrons.
Resistance() = Potential Difference(V) / Current(A)
R = I / V
The unit for resistance is ohms.
Ohms Law states that the current through a
resistor at a constant temperature is directly
proportional to the potential difference across a
A wire is an example ohmic conductor.…read more

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The total potential difference of a
voltage supply in a series circuit is shared
between the components.
The total potential difference of cells
in series is the sum of the
potential difference of each cell.
The total resistance of components
in series is equal to the sum of
their separate resistances.
Here the total resistance is 14
Parallel Circuits:
The total current through a parallel circuit
is the sum of the through the separate
components.…read more

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