First it has you set up an example circuit whose current is to be measured. The first commercial electric power transmission developed by thomas edison in the late nineteenth century used direct current.
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Direct current dc is the one directional or unidirectional flow electric charge an electrochemical cell is a prime example of dc power.
Discovery of dc current. Alternating current ac is an electric current which periodically reverses direction and changes its magnitude continuously with time in contrast to direct current dc which flows only in one direction. If you take a generator and slip a commutator on there it can produce a form of dc. In the late 19th century three brilliant inventors thomas edison nikola tesla and george westinghouse battled over which electricity system direct current dc or alternating current ac.
The tutorial goes through how to measure current with an example circuit. Well nobody invented it it s just there rather like gravity. To learn how to measure current with the analog discovery check out the tutorial on the wiki.
In this case it is a simple resistor network. Alternating current is the form in which electric power is delivered to businesses and residences and it is the form of electrical energy that consumers typically use when they plug kitchen. Direct current may flow through a conductor such as a wire but can also flow through semiconductors insulators or even through a vacuum as in electron or ion beams the electric current flows in a constant direction distinguishing it from alternating.
The truth about the discovery of electricity is a bit more complex than a man flying his kite. I recently grabbed a hantek cc 65 ac dc current clamp in the hope of being able to utilize it for capturing current waveforms on my digilent analog discovery2. And edison used his direct current system.
Because of the significant advantages of alternating current over direct current in transforming and transmission el. It actually goes back more than two thousand years. However my efforts have been less than successful and i even have a tekpower m920 ac line splitter for easy clamping of any ac current that uses a wall outlet.
Proper dc as you get from batteries is a chemical reaction which causes a transmission of energy.
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