Martin Hennum
Licensed Electrical Contractor
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Co-authored Articles (6)
How to
Measure Inductance
Inductance is the ability of a coil to stop an electrical current from flowing through it. An inductor coil can stop one current so a different one is able to flow. TVs and radios, for instance, use inductance to receive...
How Do 15A and 20A Outlets Differ? What You Should Know
Deciding on the best outlet for your project—what’s safe and effectiveWhen it comes to electrical wiring, things can get a little confusing. Maybe you’re trying to replace an outlet in your bedroom, or maybe you’...
How to
Test a Potentiometer
A potentiometer is a type of variable (adjustable) resistor. Potentiometers are widely used to control the output of electrical devices (e.g. volume of a radio or amplifier, speed of a toy or tool, lighting levels, etc.)...
How to
Tell Which Way Round a Diode Should Be
A diode is a two-terminal electronic device which conducts current in one direction and blocks current in the opposite direction. A diode can also be called a rectifier, which converts AC to DC. Since diodes are essenti...
How to
Replace a Lamp Switch
Lamps are a stylish way to bring soft light into a room, but it can be frustrating when your lamp switch stops working. Instead of throwing your lamp away, try installing a new light switch yourself! It’s an easy proje...
Complete Guide for Fixing a Broken Charger
An easy-to-follow guide for figuring out why your charger isn't working and getting it to work Is your charger only charging your phone if you hold it a certain way? Would you like to fix that? Luckily, there are some co...