* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Powerpoint
Galvanometer wikipedia , lookup
Josephson voltage standard wikipedia , lookup
Integrated circuit wikipedia , lookup
Valve RF amplifier wikipedia , lookup
Negative resistance wikipedia , lookup
Flexible electronics wikipedia , lookup
Thermal runaway wikipedia , lookup
Schmitt trigger wikipedia , lookup
Nanofluidic circuitry wikipedia , lookup
Power electronics wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Operational amplifier wikipedia , lookup
Electrical ballast wikipedia , lookup
Wilson current mirror wikipedia , lookup
Power MOSFET wikipedia , lookup
Opto-isolator wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Surge protector wikipedia , lookup
Current source wikipedia , lookup
Network analysis (electrical circuits) wikipedia , lookup
Current mirror wikipedia , lookup
Electric circuits 1 volt = 1 joule per coulomb 1 ampere = 1 coulomb per second Some terms Ampere { { Rate of current flow (coulombs/second) What is current flow in a circuit? { Electron flow? Very slow! Why is current established instantly? Voltage-current analogy: water flowing in a pipe because of pressure 1 Electrical resistance (“load”) resistance ~ friction { Produces heat – just like friction! Voltage, current and resistance { { current = Voltage produces current Resistance reduces current voltage resistance A= V Ω Ohm’s Law Electrical shocks Current produced by difference in voltage Touching two different voltage sources causes current to flow, depending on the voltage difference { This is similar to but not the same as sparking, caused by a buildup of charge on your body 2 Electric circuits A circuit is a complete pathway along which current can flow A voltage must be present for current to flow in the circuit Work can be done by the current if loads are placed in the circuit Series circuits V=A×Ω Loads connected one after the other Resistance is the sum of the loads If one load fails, the circuit is broken! 3 Parallel circuits V=A×Ω Loads are connected alongside each other Current is the sum of the branches Total resistance falls as loads are added! Why parallel circuits are dangerous The more parallel loads, the more current flows The more current flows, the heat is generated in the feed wires Eventually, the wires will melt… 4