Kirchhoff's Laws and Circuits
- Created by: theninjaemu
- Created on: 02-05-17 15:43
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- Kirchhoff's Laws and Circuits
- Kirchhoff's laws
- First law
- The sum of the current entering a junction is equal to the sum of the current exiting a junction
- The law of conservation of charge applied to electric circuits
- Second law
- The sum of the E.M.F. is equal to the sum of the P.D. in a closed loop
- First law
- Series circuits
- There is a single loop from one terminal of the source of E.M.F. to the other
- The current is the same in every position
- E.M.F. is shared between the components
- If components have the same resistance, E.M.F. is shared equally
- If components have different resistances, E.M.F. is shared proportionally
- Parallel circuits
- Provide more than one path for charges
- The amount of charge down a path depends on the resistance of the path
- The greater the resistance, the less current flows down it
- Total E.M.F. around each separate loop in a parallel circuit is equal to the E.M.F.
- Each loop can be thought of a a separate circuit- changes to one branch doesn't affect the others
- Multiple loops and adding components
- In more complex circuits, consider each loop separately
- Adding additional components in series reduces the E.M.F. shared between the original components
- Kirchhoff's laws
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