Chpt 16 notes. page- 553-563

The amount of energy transferred to any useful device depends on two things:

-The potential different of the power supply (the amount of push).

-The nature of the pathway through the loads that are using the electric potential energy.

Volt & conductivity can determine the amount of current flow.

Equation for Ohm's law: R(Ω) = V(V)/I(A) 

 

R: Resistance, measured in ohm (Ω)- is the opposition of flow and can make the pathway in a circuit more difficult to flow.

 

V: Voltage, measured in volt (V)- determines the amount of current flow.

 

I: Current, measured in amperes (A)-  is a flow of electricity through a conductor.

Superconductivity: Ability of a conductor conducting electricity without heat loss due to resistance. The highest temperature it can reach is (-133°C)

 

Factors which affect Resistance can be Length- by how long it is, it affects how great the resistance is. Cross-sectional area- by how thick or large it is, there will be less resistance. Materials used- not everything are conductors, so what is used can affect it. Lastly, Temperature- as you may be aware of, matter separate once it is heated up, so higher temperature increases resistance.

 

Kirchhoff’s current law: The total amount o f current into a junction point of a circuit equals the toal current that flows out of that same junction

 

 

 Kirchhoff’s voltage law: The total of all electrical potential decreases in any complete circuit loop is equal to any potential increases in that circuit loop.

 

Kirchhoff’s law: 

 

Ohm’s law: R=V/I,