4 Electric Current

This is the basic introduction to current flow and circuits. Really this unit is just an extension of GCSE Electricity with some harder problems using the same rules. Also you will need to remember how each component works and be able to interpret a VI graph. Always remember to check your gradient. Since V=IR a graph of V – y-axis and I – x-axis shows R as gradient. The other way around which is how we tend to do exp shows 1/R it does matter.

Circuit Construction Kit (phet animation)

AS Physics Unit 1_4 (lesson notes for section)

4.1 Current and charge

aluminium (Electrolysis of Aluminium Animation)

fluid_electrolysis (Electrolysis of Copper Chloride E=VIt)

4_1_ Flow of Charge Worksheet  (word)

Animation/Model of inside a battery (phet)

4.2 Potential difference and power

Electron Speeds Worksheet (extension – challenge!)

Electricity Calculations & Sig Figures….. I would advise all of you to look at this tutorial this week before you do the unit homework…   http://www.chem.sc.edu/faculty/morgan/resources/sigfigs/index.html . An example is V = 12V, Resistance = 62Ω. If you work out the current through the resistor as V = IR changes to V/R = I = 12V/62 Ω = 0.193548A.  The original data is 2 sig figures so you should quote the answer to this as well. Hence…

0.2A  – Wrong                0.19A – Correct          0.193548A  – Wrong

 4.3 Resistance

resistivity (animation) Use this to think about how atoms actually look inside a metal. Then imagine a drift of electrons through this.

4_3_Investigation (Practical Investigation & Worksheet)

4_3_Resistance Worksheet 1 (problems)

4_3_Resistance Worksheet 2(problems)

4.3 Resistance Networks Worksheet (problems)

Resistivity example data (this is a spreadsheet from practical with example graph)

Model (phet – resistivity of a wire)

Ohm’s Law Model (phet)

4.4 Components and their characteristics

 4_4_Graphs Worksheet (graphing problems)

LED Forwards Bias Data (Excel) Data and graph from logger of diode in forwards bias with resistor inline.

oven temp sensor (How Science Works information sheet on thermistor at work)

Thermistors (extension reading)

Diode Problem (extra problem to look at) This one is often used in the AS exam when looking at diodes


Youtube Video Tutorials “Electricity” – Steve4Physics

E01 Charge and Current. Part 1 of 2
E02 Charge and Current. Part 2 of 2
E03 Emf and voltage. Part 1 of 2
E04 Emf and voltage. Part 2 of 2
E05 IV (Characteristic) Curves Part 1 of 2
E06 IV (Characteristic) Curves Diodes Part 2 of 2 (diodes)
E07 Resistance. Part 1 of 2
E08 Resistance. Part 2 of 2
E09 Ohm’s Law
E12 Resistors in series
E13 Resistors in parallel
E14 The resistance of series and parallel resistor combinations
E23 Resistivity Part 1 of 2
E24 Resistivity Part 2 of 2
E25 Resistance and Temperature 1 of 3
E26 Resistance and Temperature 2 of 3. Semiconductors
E27 Resistance and Temperature 3 of 3 Superconductors

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