Please download the PDF of this resource using the Download PDF link in the banner above.

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.

- Voltmeter
- Sinusoidal and non-sinusoidal waveforms
- Amplitude
- Time period
- Frequency
- Instantaneous values
- Peak value
- Peak-to-peak value
- Average value
- Root mean square (rms) value
- Form factor
- Phase angle
- Combining waveforms

- Square and square roots
- Basic arithmetic

AC waveforms are common in engineering and are found in a wide range of applications such as AC power delivery, instrument measurements, control signals and audio applications. Periodic AC waveforms can be characterised by a number of key parameters that allow an engineer to produce effective designs that work with them.

Additionally, AC waveforms can be manipulated and added to produce new waveforms, a process that can be used to produce active noise cancellation that can protect the ears from noisy plants or prevent external sounds from detracting from spoken instructions or music sent to headphones.

How can AC signals be characterised and added and how can these be useful?

The above interactive can be used to simulate the possible meter and waveform combinations stated in the resource.

The above interactive can be used to investigate the properties of waveforms and compare how they change when the waveform changes, or when waveform properties change, such as period and amplitude.

The above interactive can be used to investigate the addition of two identically shaped waveforms of different amplitutes and with different phase angles.

Resources

**Electrical & Electronic:** AC theory | Resistance, reactance and impedance

**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:** The solenoid | Magnetic flux | Magnetic flux density | Magnetomotive force | Field strength | Permeability

**Prerequisites:** None