An Intimidating Experience

[ppppenguin]

Suggest that you read about and understand Ohm's lawa and Kirchoff's laws.

http://www.bbc.co.uk/schools/gcsebitesiz...rev3.shtml
http://www.electronics-tutorials.ws/dcci...dcp_4.html

Kirchoff's most widely known theory is the junction current, whereby current coming into a circuit or crossroads has to part the circuit at equal value.

Sorry, your explanation doesn't quite make sense, even as English**, let alone engineering. I thnk you're trying to explain KCL, which simply states that the sum of currents flowing into a junction is always zero. It can also be stated as the sum of currents entering a junction must be equal to the sum of currents leaving that junction.

If you apply KCL, KVL and ohm's law to any linear circuit (and many non-linear ones) your should understand what's happening. A certain caution is needed if non-linear devices are included as ohm's law can only be applied at the particular voltage across the non-linear device and current though it. A filament lamp is not linear (its resistance rises with temperature) but ohms law can still be usefully applied. That same non linearity also makes it useful in a lamp limiter. At low currents the resistance is low, so the radio etc will operate more or less normally. If the radio is faulty and tries to take a high current the resistance of the lamp will rise and thus protect the radio.

Once you've really understood KCL, KVL and ohms law you tend to use them instinctively, without even reailising you're using them. That comes with experience.

**With apologies if English isn't your first language.