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Summary AQA GCSE Physics Electricity Topic - UK Mains
AQA GCSE Physics Electricity Topic Summary notes Aesthetic and easy to understand notes Includes diagrams and labels
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ELECTRICITYphysics
UK ELECTRICITY
AC-
- Is an AC (alternating current) supply
Alternating current – - Frequency of 50Hz
current continuously varies
from positive to negative
- Potential Difference of 230V
charge
DC-
Earth wire Live wire
Direct current – the current
moves in one direction
only
Example: batteries Neutral Fuse
wire
Cable
grip
Outer
insulation
Brown (live) wire –
230V, carries the potential difference from the supply, should never touch the brown wire
because it can cause a fire or a shock
Blue (neutral) wire –
0V, completes the circuit
Yellow and green (Earth) wire – carries a current only if there is a fault, provides a low
resistance path to the ground (current takes the path of least resistance) this protects the
person from an electric shock
Fuse –
The fuse will melt if the current going through is too great. This will break the circuit and
protects the wiring and appliance.
ENERGY TRANSFERRED EQUATION ENERGY TRANSFERRED EQUATION
energy transferred = charge * time energy transferred = charge * potential difference
E = Pt E = QV
E = energy transferred in Joules (J) E = energy transferred in Joules (J)
P = power in Watts (W) Q = charge in Coulombs (c)
t = time is seconds (s) V = potential difference in Volts (V)
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