CircuitSimulator
NOTE This session was thrown together to replace the GNUCAP session due to problems with getting GCompris installed. I got a bit carried away with Ohms law and prefixes, lost the class, and went to plan B: bring up interesting circuits (high-voltage transmission, spark-gap, 2-way light switch) and talk about them.
Click to open the circuit simulator (if that fails, try the local copy).
Note that your browser must have JavaScript and Java enabled.
Startup
You should see the opening screen of the Java-based circuit simulator:
Ohm's Law
This circuit is a little advanced, so let's start with something simpler.
Open the Circuits menu, select the Basics sub-menu and the Ohm's Law circuit:
You should see a simple circuit demonstrasting one of the fundamental laws of Electronics:
[Ohm's Law], V = I x R
V stands for the voltage across a component. Think of it like the pressure in a water-hose
I stands for the electric current through a comonent. It's like the flow-rate of water through a hose.
R stands for the resistance of a component, something that impedes flow. Think of a kink in a water-hose slowing down the flow.
Hover the mouse over the left-hand resistor and note the details:
I | 10mA |
Vd | 5V |
R | 500 Ohm |
P | 50 mW |
Check the math (remember that m is a [prefix] for milli meaning one-thousanths):
I x R = 50mA * 100 Ohm = (50 / 1000) * 100 * A * Ohm = 5V
Double-check with the right-hand resistor (remember that k is a [prefix] for kilo meaning thousand).
Now adjust the Voltage across the resistors with the slider-bar:
You can also adjust the value of the resistors. Right-click on one of them and select Edit:
Now enter a new value and press OK:
And check the results again:
Joule's first Law
Note the P in the last row. That stands for Power:
[Joule's first Law], P = V x I
P stands for the Power dissipated by the component.
Circuits -> Other Passive Circuits -> Transformers -> Long-Distance Power Transmission Circuits -> Transistors -> Switch