600 million rpm. In 2013, scientists at the University of St. Andrews made headlines by propelling a tiny sphere to a record-breaking 600 million rpm (revolutions per minute). This new object out-spins that by a factor of 100. What is … Continue reading →

Start the engine and read the screen on the tachometer. While holding the tachometer, ask a friend to get into the vehicle and turn the key in the ignition. Once the engine starts, the tachometer will begin displaying the number … Continue reading →

Split the four into two pairs. Connect each pair to each other, positive to positive, negative to negative. Connect one pair to the other pair by linking one positive terminal to a negative terminal on the other pair. the ‘other’ … Continue reading →

Voltage surges can have a destructive effect on electronic equipment, including LED light bulbs. LEDs often require a certain amount of volts, depending on the type and color of the LED. Most experts recommend 2-3 volts for LEDs. However, you … Continue reading →

We sometimes use 24V battery systems in larger trucks and busses due to the vehicle’s higher power needs and long cable runs. You can also see 24V used in larger boats and some RVs with elaborate solar systems. Another typical … Continue reading →

Switching operations include ON-OFF, MOMENTARY-OFF, ON-ON, ON-OFF-ON, and MOMENTARY-OFF-MOMENTARY. These toggle switches are quality built and can switch up to 20 amps of current at 12 volts DC or 120 volts AC. How many amps can a rocker switch hold? … Continue reading →

The computer will run just fine until you hit a peak current which exceeds the limit on one of your 12 volt rails and then the machine turns off like you’ve just pulled the plug. Below is a list of … Continue reading →

A three prong plug is designed so that electricity can be safely supplied to electrical appliances. The third prong grounds the electricity to protect anyone who uses the metal-encased appliance from electric shock. Why do some plugs have 3 prongs? … Continue reading →

Check the Power Module If the components look fine, you’ll need to power up the circuit board. Measure the voltage of the power rails with the multimeter. Both the input and output of the voltage regulator need to show the … Continue reading →

However, if you don’t calibrate your battery regularly, you may eventually find your laptop suddenly dying on you when you’re using it—without any prior warnings. When this happens, it’s definitely time to calibrate the battery. Some modern devices may not … Continue reading →

Choose Apple menu > Shut Down and wait for your Mac to shut down. Press Shift-Control-Option on the left side of the built-in keyboard, then press the power button at the same time. If the battery is removable: Shut down … Continue reading →

Fraying: Do you see obvious damage to the USB cable? If you notice that the cord is bent or fraying, it is probably time to replace it. Damage is not always visible, though, so try plugging the cable into a … Continue reading →

Coming in contact with an electrical voltage can cause current to flow through the body, resulting in electrical shock and burns. Serious injury or even death may occur. Can you touch AC current? No, because current always flows in a … Continue reading →

Symptoms of a failing computer power supply Random computer crashes. Random blue screen crashes. Extra noise coming from the PC case. Recurring failure of PC components. How do I know if my power supply is bad? The most obvious sign … Continue reading →