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Below are a series of interactives which support the resource. Each interactive can be launched by clicking on its image, or through links in the PDF itself.

Some resources have pre-requisites; where this is the case, you'll be able to access any required resources through the Pre-requisites section.

- The solenoid
- Magnetic flux,
*Φ* - Magnetic flux density,
*B* - Magnetomotive force,
*F*_{m} - Field strength,
*H* - Permeability,
*μ*and_{0}*μ*_{r}

When AC power is distributed and used in an electrical power application there will usually be a monitoring system in place to detect any faults that will inevitably develop through prolonged, long-term use.

How can engineers use the characteristics of an AC circuit to detect when a fault condition has occurred?

The above interactive allows you to demonstrate a practical design for a normally closed solonoid valve - no fluid flows unless action is taken.

The above interactive shows a bar magnet. the slider lets you change the magnetic flux, while the button option "Flux density" draws three unit areas in different locations.

The above interactive allows you to explore how various factors affect the magnetic field strength,

Resources

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**Mathematics:** Phasors | Vector addition | Pythagoras' theorem | Trigonometry

**Prerequisites:** None

Resources

**Electrical & Electronic:** AC true, reactive and apparent power | AC power factor

**Mathematics:** Vector addition | Pythagoras' theorem | Trigonometry

**Prerequisites:** AC phasors and fault detection

Resources

**Electrical & Electronic:** AC Theory | Resistance, reactance and impedance | Potential divider in an AC circuit | Low pass and high pass filters

**Mathematics:** Vector addition | Pythagoras' theorem | Trigonometry | Phasor multipilcation and division (stretch)

**Prerequisites:** AC phasors and fault detection

Resources

**Electrical & Electronic: **Ohm's law | Electrical power | Kirchhoff's current law (1st law) | Kirchhoff's voltage law (2nd law) | Resistors in series and parallel

**Mathematics:** Simultaneous equations

**Prerequisites:** None

Resources

**Electrical & Electronic:** Voltmeter | Waveforms | Amplitude | Time period | Frequency | Instantaneous values | Peak-to-peak value | Peak value | Combining waveforms | Root mean square (rms) value | Phase angle | Form factor | Average value

**Mathematics: ** Square and square roots | Basic arithmetic

**Prerequisites: ** None