Can I use my electrical appliances or electronics in Australia?

The safe answer is NO. Australia operates on 220-240 volts. However, you should check your device for allowed voltages -- some devices may be "dual voltage", allowing a wider range from 100-240V.

You can purchase voltage converters and adaptors fairly cheaply from electrical stores such as Radio Shack prior to leaving for Australia.

You can read more about the electrical requirements abroad and the differences between electrical adapters and voltage converters from Voltage Valet, Radio Shack, and About.com.