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AQA GCSE P2 Electricity (new spec)

Static and Current Electricity for the AQA Physics Specification

Tony Baker

on 9 June 2013

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Transcript of AQA GCSE P2 Electricity (new spec)

Static Current Electricity that is fixed - usually on insulators substances that do not conduct Flow of electricity Measured in Amps (A) A = Coulombs per Second Depends on Potential Difference and Resistance R= V/I Ohm unit of Resistance Ohm's Law The current is a metal is proprtional to the applied pd as long as the temperature remains constant 1 Ohm = 1 Volt per Amp Have electrons or ions that can move e.g.metals Voltmeter Because their electrons are not free to move Electrons removed, leaving positive charged object Ammeter pd (potential difference) = energy/charge (J/C) Electricity that moves – through conductors In this circuit:
2 Coulombs per second flow
Each delivers 6 Joules to the bulb
So the power is 6 J/s or 6 W (Watts) Energy = Power x time
= W x s

or = kW x hr (as in unit P1)

Energy = I x t x V Why is the plane safe if struck by lightning? Examples might include filament bulbs, fluorescent
bulbs and light-emitting diodes (LEDs). Knowledge and understanding of the use of thermistors
in circuits, eg thermostats is required.
Knowledge and understanding of the applications of
light-dependent resistors (LDRs) is required, eg
switching lights on when it gets dark. Candidates should be able to explain resistance
change in terms of ions and electrons. Candidates should be aware that there is an increasing
use of LEDs for lighting, as they use a much smaller
current than other forms of lighting. Knowledge of a negative temperature coefficient
thermistor only is required. Candidates should be able to compare and calculate
potential differences of d.c. supplies and the peak
potential differences of a.c. supplies from diagrams of
oscilloscope traces.
Higher Tier candidates should be able to
determine the period and hence the frequency of
a supply from diagrams of oscilloscope traces. Candidates should be familiar with both two-core and
three-core cable.
Knowledge and understanding of the materials used in
three-pin plugs is required, as is the colour coding of
the covering of the three wires. Candidates should realise that RCCBs operate by
detecting a difference in the current between the live
and neutral wires. Knowledge of how the devices do
this is not required. Candidates should be aware that some appliances are
double insulated, and therefore have no earth wire
connection. Candidates should have an understanding of the link
between cable thickness and fuse value. wasted in filament bulbs by heating. Less energy is
wasted in power saving lamps such as Compact
Fluorescent Lamps (CFLs).
Candidates should understand that there is a choice
when buying new appliances in how efficiently they
transfer energy.
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