How much voltage can a USB handle? USB operates at 5V, so that means a maximum of 2.5 watts. USB 2.0 has the same power limit. But later there were add-ons to the spec for battery charging, allowing up to … Continue reading →

A 14-guage extension cord can handle that much current, but remember that an air conditioner, like most appliances, draws more current when it starts up. For this reason, and to prevent poor performance because of voltage drop, it’s safer to … Continue reading →

The current in a circuit is directly proportional to the electric potential difference impressed across the circuit and inversely proportional to the resistance of the circuit. Reducing the current can be done by reducing the voltage (choice A) or by … Continue reading →

No, each voltage line 24v and 40v has their own set of interchangeable tools and batteries… Can you use a 40V battery in a 24V tool? No, not without intervening circuitry to step down the voltage to 20 volts. You … Continue reading →

The regulated power supply will accept an AC input and give a constant DC output. What should be achieved by the regulated power supply? A regulated power supply is used to ensure that the output remains constant even if the … Continue reading →

line. IEC 60417-5007, the power-on symbol (line), appearing on a button or one end of a toggle switch indicates that the control places the equipment into a fully powered state. (1 or | means on.) Is the O or I … Continue reading →

A lot of devices are powered by 12-volt DC electricity so they can be used while traveling. Typically, these products can only be operated in vehicles, because buildings are wired with alternating current. Is 12V current AC or DC? – … Continue reading →

Any switched-mode power supply that gets its power from an AC power line (called an “off-line” converter) requires a transformer for galvanic isolation. How does a switched-mode power supply work? In switching power supply designs, the input voltage is no … Continue reading →

Place the sealed battery inside the freezer and leave it overnight or at least 12 hours. By exposing the battery to low temperatures such as the inside of a freezer, it allows the battery cells to recharge a little, enough … Continue reading →

What is the switch on power supply? This switch is used to set the input voltage to the power supply to either 110v/115v or 220v/230v. In other words, it’s telling the power supply how much power is coming from the … Continue reading →

12 volts DC is not a shock hazard. You can’t touch the wires in your 120V AC household electrical system without getting a nasty, dangerous shock, but you can touch bare wires carrying 12V DC in your car, even lay … Continue reading →

Since 12V lead-acid batteries were originally designed for cars, there is a lot stuff that runs this way. 18V would be risky, I would not try to plug a 12V device into an 18V battery. But if you happen to … Continue reading →

Resistors don’t reduce current and voltage instead it opposes flow of current and produce drop in voltage across the terminals. Do resistors decrease amperage? A higher resistance results in a lower amperage. The resistance of a resistor is measured in … Continue reading →

A resistor resists current flow, regardless of whether that current is direct (DC) or alternating (AC). Any resistor type will work with 220V AC (as long as its voltage rating is not exceeded) but what’s important is the power, which … Continue reading →

What is the difference between a 12V relay and a 5V relay? The voltage ratings are what the coil needs to energize properly. The 12V coil will likely have a higher resistance than the 5V coil. Coil resistance, voltage and … Continue reading →