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Compared to amps, volts, and watts, ohms are a different kind of measurement, though also very common. Ohms show the resistance of materials like wiring: How much they impede the flow of electrons. The reason household wiring is usually copper or aluminum is that these materials are affordable and also have lower ohms, which means low resistance/high conductivity.

It is possible to change a light fixture by only flipping the light switch, but it’s better to be safe than sorry. Exercising extra caution when working with electricity is always important. Take the extra few minutes at your electrical box to cut the power at the circuit breaker. Once you’ve flipped the circuit breaker and the light switch, use a voltage tester to confirm the power has been turned off.

A low-voltage landscape lighting system using 15 to 20 LED lights for six hours a night will average about $5 to $10 a month in electricity costs. This is considered affordable lighting for many homeowners. Most modern landscape lights use LED bulbs, but some older styles may use halogen or incandescent bulbs, which can cost up to five times more than LEDs in electrical costs.

The safest way to pull an electrical cord from the wall outlet is by gently but firmly grabbing the plug and pulling it out. Pulling on the cord instead of the plug can cause damage to the cord, leading to an increased risk of electrical problems like fire or electric shock. If you notice damaged wiring on an appliance or device, it’s best to stop using it immediately.