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To determine if an electrical outlet is blown, look for visible signs of damage such as a burning or smoky smell, burn marks, or a melted or discolored plastic cover. If you notice a burning smell, contact an electrician immediately. Other signs include a plug that keeps falling out or the outlet not working when you test it with different devices. For further troubleshooting, you can use a voltage tester or multimeter to check for power; a reading of zero indicates a problem. Also, check your circuit breaker or fuse box to see if the circuit was tripped and reset it if necessary. If these steps don't resolve the issue, the outlet may need to be replaced.

A voltmeter measures the voltage of AC or DC electrical current. Unlike a multimeter, measuring voltage is a voltmeter’s only function. Voltage is the potential difference between two points within a circuit. Measuring voltage with a voltmeter can help identify wiring issues or determine whether a battery is dead.

No, both switches do not need to be on for a 3-way switch to work. When the two switches are in opposite positions, the circuit is open and the light is off. Flipping either switch closes the circuit and turns the light on. So, either switch can turn the light off independently, and both switches do not need to be in the same position for the switch to function.

The most common type of electrical outlet is a 3-prong outlet, which has two flat blades (one is wider than the other) and a round grounding pin. Older homes typically have 2-prong outlets that aren’t as safe as more modern options and are generally not up to current electrical codes.  Other outlets you can find in your home include 20A, 125 volt varieties for larger appliances like refrigerators or washing machines. 

There are also GFCI outlets, which protect against electrical shock in wet areas, such as bathrooms and kitchens, and arc fault circuit interrupter (AFCI) outlets, which protect against electrical fires caused by arcing.