Ohm’s Law Sim

Posted by Mr Mallon on February 17, 2023

Use this sim to determine the relationship between the voltage across a resistor and the current passing through it.
Notice the variable resistor will vary the current in the circuit.

Take current and voltage readings in a table and plot a graph current in the x-axis and voltage in the y-axis.

17Feb
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Cool down with a thermistor!

Posted by Mr Mallon on February 16, 2023

A thermistor is a resistor whose resistance changes with temperature.
When it becomes cold its resistance gets bigger. When it becomes hot its resistance becomes smaller.

Check the voltages across the voltage divider.
The mosfet acts like a switch. When the voltage at its gate becomes bigger than 2 volts it will switch on the relay which in turn switches the fan on.

16Feb
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Share the voltage!

Posted by Mr Mallon on February 14, 2023

Click the picture to go to the sim.

Some questions:

  1. What do you notice about the variable resistor’s voltage as its resistance increases?
  2. What do you notice about the sum of the voltages across the resistors?
  3. For each resistor in turn, take the ratio of voltage across it and divide by the resistance. What do you notice?
14Feb
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Dark sensing circuit.

Posted by Mr Mallon on February 14, 2023

Click here for the simulation of a light dependent transistor being used to0 turn on a LED when it gets dark.

14Feb
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S3 Electricity Nasty Nine Test

Posted by Mr Mallon on March 18, 2014

18Mar
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Radiation Quiz.

Posted by Mr Mallon on December 16, 2013

Here is a quiz for you to try on the topic of radiation.
The answers to the quiz will appear shortly.
Best of luck!

16Dec
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Newton`s Cannon

Posted by Mr Mallon on November 9, 2013

Isaac Newton thought this experiment up about firing a cannon ball from a cannon.

Check out this movie. Roll your mouse over Isaac`s picture to get more info.

9Nov
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Satellite Research

Posted by Mr Mallon on November 7, 2013

Here is a presentation on satellites.

7Nov
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Geostationary Satellites

Posted by Mr Mallon on October 29, 2013
Categories: National 4,National 5
29Oct
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Electromagnetic Spectrum Information

Posted by Mr Mallon on October 7, 2013

Roll your mouse over each of the members of the electromagnetic spectrum and find out how they are detected and used.

Use this downloadable sheet to record your research. Research sheet

7Oct
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