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.
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.
Click the picture to go to the sim.
Some questions:
Click here for the simulation of a light dependent transistor being used to0 turn on a LED when it gets dark.
Here is a simulation of a spring with a mass attached.
Press the play button to start.
In this code I have added a slider to change the value of the acceleration of the floor.
Think of the floor of an elevator.
A positive acceleration indicates that the elevator is accelerating upwards and a negative acceleration indicates a downward acceleration.
Press the play button to start the program and then the pencil button to examine the code
Here is a vpython code to visualise the normal force acting on a block sitting on the foor.
The normal force is provided by the floor. You can think of it as a supporting force.
If the normal force was removed the box would be in freefall!
Think of standing on a trampoline. The trampoline webbing provides an upwards force to stop you falling.
This normal force would be the reading on a weighing scale.
Change the value of acceleration variable “a” in the code to see what happens to the normal force when the floor is accelerating upwards or downwards
The normal force is the reading of the weight in newtons on the weighing scale.
What is your weight reading when the floor is accelerating upwards, ie a positive acceleration and when the floor is accelerating downwards, a negative acceleration?
Press the small pencil to change the code. Then run.
If you are investigating sound frequency while studying waves and have access to a BBC Microbit then have some fun coding to hear the octave of a frequency.
An octave means that the frequency is doubled. Pressing one button creates a sound of frequency 256 Hz and pressing the other double the frequency to 512 Hz.
Have some computing physics fun with the microbit.
The above code can be typed into the microbit python editor.
