AC = alternating current. The flow of the current alternates direction
DC= direct current. Only flows in one direction
We will only be working with DC.
Current (I)= the flow of an electric charge. Unit: ampere (A) or coulomb/second.
The equation for current is listed in the reference table as I=(change in q)/(t)
Potential difference (V)= the driving force behind causing a flow of charge.
SI Unit: volt (V)
1 V=1 J/C
The equation to find V is V = W/q
Resistance (R)= oppostition to the flow of the current. It measures the degree and object opposes a current
SI Unit: ohm (theres a funky symbol in the reference table for it) which was named after a German physicist
Ohm's Law: At Constant Temperature, The Current In A Metallic Conductor Is Directly Proportional To The Potential Difference Between Its Ends.
The equations for Ohm's law are as follows... R=V/I....I=V/R.....V=IR
1 ohm = 1 Volt/Amp
We did two exaples in class and then worked on homework for the time we had left.
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4 comments:
this blog helped describe the formulas for this chapter. thanks
This is a really good and quick summary...I might just print it out for future reference. All these terms and units can get confusing, but here is a way to remember:
Potential difference's symbol is V and it is measured in V (volts)
Current’s symbol is I and the units are ampere – think “I am here”
I know it's stupid...but maybe it will work
Thanks for the summary it was helpful.
Nice job summing things up, it made the formulas and everything a lot clearer.
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