Wave Speed

Wave speed is given in meters per second (the number of waves that pass per second). Wavelength is measured in meters and frequency is measured in hertz (Hz), or number of waves per second.


The efficiency of a device is the proportion of input energy that is converted to useful energy.


transformer is an piece of electrical apparatus which will increase or decrease the voltage in an alternating current. It can be designed to "step up" or "step down" voltages and is based on the magnetic induction principle.

The Motor Effect

A current-carrying wire or coil can exert a force on a permanent magnet. The force increases if the strength of the magnetic field and/or current increases. This is called the motor effect.

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