You can perform several simple electrical tests on all kinds of electrical things around your home. All you will need is one or more of three inexpensive testers: a continuity tester, a multimeter, and/or a circuit tester.

Continuity Tester

These models are among the continuity testers (left), multimeters (middle), and circuit testers (right) available at hardware and electrical parts stores.

Electricity needs a continuous path or circuit in order to flow. It's like a two-lane road from point A to point B and back. If one or both lanes are blocked, traffic--in this case, electricity--stops. A continuity tester is useful for checking cords and wires to make sure they can conduct electricity.

To test for continuity, follow these steps:

1. Disconnect the cord from the power source (electrical receptacle). Make sure any switches on the device are on.
2. Attach the alligator clip to one prong of the cord.
3. Touch the tip of the continuity tester to the other prong. If there is continuity, the tester will light up. If not, it won't.

A continuity tester can tell you whether electricity can flow through a cord.

Here's how it works: The continuity tester sends electricity from an internal battery through one cord prong and down the wires. If the light gets electrical current from the other prong it lights up, meaning that the path is good. Otherwise, something is stopping it. You can remove the cord from the appliance and test each of the two wires separately to see which one doesn't work. If both work, the short is in the appliance itself. You can buy a continuity tester for less than $5.00.

Multimeter

A multimeter (also called a volt-ohmmeter or VOM) is another way of testing continuity. It also can measure the amount of alternating current (AC or household current) or direct current (DC or battery current) in a plugged-in or live circuit. It can check voltage, too.

Analog multimeters measuring conductivity/resistance must first be adjusted for a zero reading. Check instructions that come with a new multimeter.

For example, a multimeter can verify that there are about 120 volts in an AC circuit or that a 9-volt battery is fully charged. In addition, a multimeter can check resistance. A continuity tester checks resistance, but answers yes or no. A multimeter checks resistance and reports how many ohms (the measurement of resistance) a circuit carries.