Earthquake is a natural phenomenon of crustal movement, which brings huge losses to people's lives and property. If a prediction is made before an earthquake arrives, the loss can be reduced a lot. Our children can also participate in this activity. "If you want to work well, you must first sharpen your tools", let's first make a small earthquake prediction instrument-earthquake warning light!
Hand-made earthquake warning lights 1. Materials:
One piece of wood, one long and one short piece of wood, one thick copper wire and one thin iron wire of 10 cm long, one needle, one bulb, one large battery, two thin wires, and several wood screws ,tape. Scissors, needle-nose pliers, screwdrivers and other tools.
Hand-made earthquake early warning lights 2. Production method:
Use wooden boards and wooden strips to build the bracket and fix it with wood screws. Bend one end of the thick copper wire into a small circle, pierce an eye in the middle section of the vertical wooden strip of the support, and then insert the other end of the thick copper wire into the eye to fix it. Dig a small hole at the top of the horizontal wooden bar to install the electric ball. Fix one end of the thin iron wire on the horizontal wooden bar, and pass the other end into the eye of the needle, twist it tightly.
Use wood planks and slats to build the support, and fix it with wood screws. Bend one end of the thick copper wire into a small circle, pierce an eye in the middle section of the vertical wooden strip of the support, and then insert the other end of the thick copper wire into the eye to fix it. Dig a small hole at the top of the horizontal wooden bar to install the electric ball. Fix one end of the thin iron wire on the horizontal wooden bar, and pass the other end into the eye of the needle, twist it tightly.
Install the power supply. Wrap one end of a wire around the small electric bead rib, and install the carbon monoxide into the hole on the top of the bracket, and fix the other end to the bottom of the battery; fix one end of the other wire to the bottom of the battery, and connect the other end On thick copper wire. Finally, fix the battery on the wooden board with tape.
Three, the principle of use:
Due to gravity, the needle and the thin copper wire sag downward, and the needle tip penetrates into the thick copper wire circle. Under normal circumstances, the copper wire circle is not touched around, the circuit is blocked, and the light does not turn on. If the needle collides with the copper wire loop and the light is on, it means that the ground is shaking.
Variable Frequency AC Power Supplies
The VFP series AC Power Supplies are high precision, high efficiency, low THD adjustable AC power supplies that converts the input mains power through AC→DC→AC conversion, and gives a pure sine wave AC output with adjustable voltage & frequency within a certain range. Also known as Variable Frequency AC Power Source.
According to the difference in the number of output phases, it can be divided into single-phase and three-phase AC power supplies.
The output power of single-phase adjustable AC power supply ranges from 500VA to 200KVA, the output power of three-phase adjustable AC power supply ranges from 3KVA to 600KVA, the output voltage is divided into 0 ~ 150Vac, 150 ~ 300Vac, and the output frequency is adjustable from 45Hz to 70Hz with 50/60Hz fixed frequency output.
Through the friendly operation panel, you can read the output data such as output voltage, output current, output power, power factor, etc., providing accurate data records for your test, and can add RS485 interfaces as standard, following the MODBUS-RTU international communication protocol, which can realize remote control and operating status monitoring of the power supplies.
This series of adjustable AC Power Supplies have comprehensive protection functions, such as: over voltage, over current, over temperature and short circuit protections, which can protect the AC power supplies and DUT from damages. At present, it is mainly used for Various electrical appliance manufacturers conduct grid simulation tests on electrical appliances according to the voltage/frequency requirements of different countries. Imported electrical appliances are used for the domestic demand for variable voltage and frequency conversion, as well as various AC motors and AC transformers.
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Yangzhou IdealTek Electronics Co., Ltd. , https://www.idealtekpower.com