Thursday 22 August 2024
Wednesday 21 August 2024
Week 5 Term 3 2024 AC Electricity
Homework
Basic Circuit Revision
Act 13A, p.205-206 Level 2 D.C. Circuit Revision
Internal Resistance of a Battery
Act 13B, p.210-211 Internal Resistance of a Battery
Ex 6B, P.261-262 Internal Resistance of a Battery
Resistor Networks (Resistors in Series and Parallel)
Ex 6A, p.251-253 Resistor Networks
Kirchhoff’s Laws
Act 13C, p.214-216 Kirchhoff's Laws
Ex 6C, p.267-272 Kirchhoff's Laws
Capacitors
Act 14A, p.240 Capacitance & Capacitors
Act 14B, p.244-245 Capacitor Networks & Energy
Act 14C, p.249-251 Charging & Discharging Capacitors
Ex 6D, p.277-280 Capacitor Energy
Ex 6E, p.283-284 Capacitors
Ex 6F, p.289-292 Capacitor Networks
Ex 6G, p.298-300 Charging & Discharging Capacitors
Inductors
Act 15A, p.259-260 Induced Voltage & Current
Act 15B, p.263-264 Transformers
Act 15C, p.268-269 Inductance
Act 15D, p.272-273 Voltage and Current Graphs for the Inductor
Ex 6H, p.303-305 Inductance in DC Circuits
Ex 6I, 308-310 Inductance: Self; Mutual; Time Constant; Energy Stored
Ex 6J, p.311-312 Transformers
AC Electricity
Act 16A, p.265-266 Peak and rms voltage and current
Act 16B, p.260 Capacitor Reactance
Act 16C, p.275-276 Voltage and Current in a RC circuit
Act 16D, p.279 Voltage Current and Impedance in a RC circuit
Act 16E, p.282 Inductor Reactance
Act 16F, p.286-287 Voltage Current and Impedance in a RL circuit
Act 16G, p.289 The LCR series circuit
Act 16H, 293-296 Resonance
Ex 6L, p.316-317, RC Circuits
Ex 6M, 319-320, LC Circuits
Ex 6N, 321-324, LCR Circuits
Capacitor Reactance
Inductor Reactance
Resistors in AC Circuits
Capacitors in AC Circuits
Inductors in AC Circuits
RCL in AC Circuits - Part 1
Capacitors in AC Circuits - Part 3
Inductors in AC Circuits - Part 3
RC in AC Circuits - Part 4
RL in AC CIrcuits - Part 4
RCL in AC Circuits - Part 3
Summary of RCL Circuits
RCL Resonance
RCL Phase Relationships
MIT Mathlet on RCL Phase Relationships - Interactive
Impedance of a Capacitor Resistor Circuit
Z = √(XC2 + R2)
θ = tan-1(-XC/R) = tan-1(-VC/VR)
The Capacitor Reactance is 90° behind the Resistance
The Capacitor Voltage is 90° behind the Resistor Voltage
Impedance of a Inductor Resistor Circuit
Z = √(XL2 + R2)
θ = tan-1(XL/R) = tan-1(VL/VR)
The Inductor Reactance is 90° ahead of the Resistance
The Inductor Voltage is 90° ahead of the Resistor Voltage
Impedance of a RCL Circuit
Z = √((XL - XC)2+ R2)
θ = tan-1((XL - XC)/R) = tan-1((VL - VC)/VR)
Resonance
Understanding Inductance and Back EMF
A.C. Circuits & Resonance
Tuesday 13 August 2024
Week 3 Term 3 2024 Inductors
Basic Circuit Revision
Act 13A, p.205-206 Level 2 D.C. Circuit Revision
Internal Resistance of a Battery
Act 13B, p.210-211 Internal Resistance of a Battery
Ex 6B, P.261-262 Internal Resistance of a Battery
Resistor Networks (Resistors in Series and Parallel)
Ex 6A, p.251-253 Resistor Networks
Kirchhoff’s Laws
Act 13C, p.214-216 Kirchhoff's Laws
Ex 6C, p.267-272 Kirchhoff's Laws
Capacitors
Act 14A, p.240 Capacitance & Capacitors
Act 14B, p.244-245 Capacitor Networks & Energy
Act 14C, p.249-251 Charging & Discharging Capacitors
Ex 6D, p.277-280 Capacitor Energy
Ex 6E, p.283-284 Capacitors
Ex 6F, p.289-292 Capacitor Networks
Ex 6G, p.298-300 Charging & Discharging Capacitors
Inductors
Act 15A, p.259-260 Induced Voltage & Current
Act 15B, p.263-264 Transformers
Act 15C, p.268-269 Inductance
Act 15D, p.272-273 Voltage and Current Graphs for the Inductor
Ex 6H, p.303-305 Inductance in DC Circuits
Ex 6I, 308-310 Inductance: Self; Mutual; Time Constant; Energy Stored
Ex 6J, p.311-312 Transformers
Right Hand Screw Rule
Right Hand Slap Rule
Magnetic Flux
Lenz's Law
Faraday's Law & Lenz's Law
Inductance
Inductors Explained - The basics how inductors work working principle
Transformers
The ratio of the secondary to primary voltage is equal to the ratio of the secondary to primary turns
Vs/Vp = Ns/Np
In an Ideal Transformer
Secondary Power = Primary Power
In reality, energy is lost through heat from eddy currents generated in the soft iron core from the changing flux.
NB: As Voltage is often referred to as e.m.f. the Symbol "e" or "E" is often used in engineering to refer to e.m.f.
This is the case in the video below.
After explaining how basic Transformers work, this video goes on to explain 3-Phase Transformers.
NZ Street Step-Down Transformer
Internal Diagram of a Transformer
How Do Substations Work?
Fuse MCB, How it Works
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