Homework:
- Act 13A, p.205-206 Level 2 D.C. Circuit Revision
- Act 13B, p.210-211 Battery Internal Resistance
- Act 13C, p.214-216 Kirchhoff's Laws
- Ex 6A, p.251-254 Level 2 D.C. Circuit Revision
- Ex 6B, p.261-261 Internal Resistance of a Battery
- Ex 6C, p.267-272 Kirchhoff's Laws
Electrical Charge
Current
Current is the rate of flow of Charge
I = Δq/Δt
Current
Voltage
Voltage (Potential Difference) is the change in energy (work done) to each coulomb of charge between two points on a circuit, or two points across an electric field
Voltage
Voltage (Potential Difference) is the change in energy (work done) to each coulomb of charge between two points on a circuit, or two points across an electric field
V = ΔE/Q
Ohm's Law & Resistance
Power
Circuit Symbols
Ohm's Law
Ohm's Law
Internal Resistance of a Battery
Batteries can be thought of as having an ideal voltage supply E.M.F. (Electromotive Force) in series with an internal resistance
V = 𝛆 - Ir
How to find the internal resistance of a battery
Kichhoff's Laws
Kirchhoff’s Current Law
“At any junction in a circuit, the total current entering the junction equals the total current leaving the junction”
Kirchhoff’s Voltage Law
“Around any closed path of a circuit, the total of all the potential differences, V, is zero”
“At any junction in a circuit, the total current entering the junction equals the total current leaving the junction”
Kirchhoff’s Voltage Law
“Around any closed path of a circuit, the total of all the potential differences, V, is zero”
Kirchhoff's Rules for Circuit Analysis - Explanation
Kirchhoff's Rules for Circuit Analysis - Example 1
Kirchhoff's Rules for Circuit Analysis - Example 2
Kirchhoff's Rules for Circuit Analysis - Example 3
