A Burgular Alarm
Working model for what, exactly?
a physics model can be excellent if it has a right demonstration correct working and display and capability to impress the audience right;y
There are several ways one can make a working model of an earthquake. You can use an empty 2 liter bottle, clay, baking soda, and dish detergent to make a working earthquake.
manhattan
First, get a good understanding on the "anything" you want to model.
Ask your teacher.
see your physics book
COLING BELL give the lsit of working models in the wikipidea
Don't make it
If you want to make a WORKING model for nuclear physics, look at the Manhattan Project, and you'll be joining Miss Curie. Please rephrase the question or figure out what it is exactly you should be asking for.
Just make a physics model of the properties which are associated with electricity but are tangible in the real world. I.e. the water analogy of electricity. Water pressure is voltage, electrical current is analogous to water flow rate and a restriction in a water pipe could be resistance. but it is important that this is only a model for certain circumstances and will break down if you try to carry the analogy too far.
you can make a model of electromagnet by actually making it......... ;)