BASIC RULES IN CIRCUIT

A few basic rules that electrical circuits always follow are useful before we start.

• A voltage of 1V across a resistance of 1 Ohm will cause a current flow of 1 Amp, and the resistor will dissipate 1 Watt (all as heat).
• The current entering any passive circuit equals the current leaving it, regardless of the component configuration.
• Electricity can kill you!
• The danger of electricity is current flowing through your body, not what is available from the source.  A million volts at 1 microamp will make you jump, but 50V at 50mA can stop you dead - literally.
• An electric current flowing in a circuit does not cause vibrations at the physical level (good or bad), unless the circuit is a vibrator, loudspeaker, motor or some other electro-mechanical device.  (i.e. components don't vibrate of their own accord unless designed to do so.)
• External vibrations do not affect the operation of 99.9% of electronic circuits, unless of a significant magnitude to cause physical damage, or the equipment is designed to detect such vibrations (for example, a microphone).
• Power is measured in Watts, and PMPO does not exist except in the minds of advertising writers.
• Large capacitors are not intrinsically "slower" than small ones (of the same type).  Large values take longer to charge and discharge, but will pass AC just as well as small ones.  They are better for low frequencies.
• Electricity can still kill you, even after reading this article.