Fuse boxes contain a fuse for each circuit in your house or apartment. According to Acme How To, "A fuse provides protection for each of your electrical circuits by stopping the flow of current if an overload or fault occurs." If you notice several appliances, light switches and power outlets stop working simultaneously, chances are you've blown a fuse. Checking your fuse box and changing blown fuses requires no special training or equipment.
Unplug and turn off all electronic devices plugged into the affected circuit.
Turn off the master switch to the fuse box if your fuse box has one.
Remove the blown fuse. A blown fuse will appear a "red" colour either behind a clear window or on the fuse itself, showing it has been blown.
Place the new fuse in place of the old fuse. Turn the fuse box master switch back on. Check your electronic devices on the affected circuit to ensure all are functioning.
Watch a video tutorial to gain a visual understanding of checking your fuse box.
Do not touch the metal portion of the fuse. Only replace old fuses with fuses of the correct amp rating. If the fuse blows again shortly after replacing it, contact an electrician as a serious wiring issue exists.