Notes from pg 553-563

1)The amount of current flow in a circuit and therefore the amount of energy transferred to any useful device, depends on two things:
-the potential difference of the power supply(the amount of push) and
-the nature of the pathway through the loads that are using the electric potential energy.
2)A measure of the opposition to the current flow in a circuit is known as the resistance.
3)The current and the potential difference have a direct relation because as the current in a circuit increases the voltage tends to increase as well, as long as other variables such as temperature, are controlled. There is a resistance of 1 Ω when 1 A of current flows with a potential difference of 1 V across a resistor.
4)The Ohm's law states that the V/I ratio is constant for a particular resistor. (R=V/I)

5)Where "R" is the resistance in volts/ampere, which is given the derived unit of ohm (Ω), after Georg Simon Ohm (1787-1854), V is the potential difference in volts and I is the resulting current in amperes (A).

6)The resistance of a conductor depends on its length, cross-sectional area, the material it is made of and its temperature.

7)In a series circuit, the loads are connected one after another in a single path, whereas in a parallel circuit, they are connected side by side.

8)The Kirchhoff's current law states that the total amount of current into a junction point of a circuit equals the total current that flows out of that same junction.

9)Kirchhoff's voltage law states that the total of all electrical potential decreases in any complete circuit loop is equal to any potential increases in that circuit loop.

10)We can determine the overall resistance of series or parallel circuit elements by applying both Ohm's law for resistance and both of Kirchhoff's laws.