Summary AQA GCSE Physics Electricity Topic - Circuits

ELECTRICITY
physics




Open Switch
In order for charge to flow in a circuit, there
must be potential different (from a battery
Closed Switch or cell) and the circuit must be closed.

Cell


Battery CHARGE FLOW EQUATION
charge flow = current * time
Ammeter
A Q = It

Voltmeter Q = charge flow in Coulombs (c)
V
I = current in amps (A)
Filament Lamp
t = time is seconds (s)

Resistor


Fuse If a circuit has a single loop, the current is
the same everywhere in the circuit. There
are two factors that determine the current
Variable Resistor
of a circuit:

Thermistor Resistance (R) and Potential Difference (V)

This can be shown in the equation…
Light Dependent
Resistor
Diode
CURRENT EQUATION
Light Emitting Diode
potential difference = current * resistance

V = IR

V= potential difference in volts (V)

I = current in amps (A)

R = resistance in ohms (Ω)