When choosing a power supply for a laptop with 65W instead of 90W, it's important to ensure that the voltage and polarity of the new power supply match the requirements of the laptop. Additionally, the new power supply should have a compatible connector to the laptop's power input. It's also important to consider the charging time and performance of the laptop with the lower wattage power supply. It's recommended to consult the laptop's manufacturer or a certified technician to ensure compatibility and safety. **

For two 5V 90W LED strips, you would need a power supply that can provide a total of 180W (90W per strip). Since the LED strips operate at 5V, you would need a power supply that can deliver at least 36A (180W / 5V = 36A). It is important to choose a power supply that can handle the total power requirements of both LED strips to ensure they operate properly and safely. **

For two 5V 90W LED strips, you will need a power supply that can provide at least 180W of power in total. Make sure the power supply is rated for 5V output to match the LED strips' voltage requirement. Additionally, ensure that the power supply has enough current capacity to handle the combined load of both LED strips, typically around 36A (180W / 5V = 36A). It is recommended to use a power supply with a slightly higher wattage rating to ensure stable and reliable performance. **

The cable of the 90W power supply should be at least 2 meters long if there is a demand of 180W. This is because the cable needs to be able to handle the higher power demand without overheating or causing a voltage drop. A longer cable also allows for more flexibility in positioning the power supply in relation to the device it is powering. **

To connect your MacBook Air 2022 to an external monitor with 90W power delivery via USB-C/Thunderbolt, you can use a USB-C/Thunderbolt to HDMI or DisplayPort adapter or cable. Simply connect one end of the adapter or cable to the USB-C/Thunderbolt port on your MacBook Air and the other end to the HDMI or DisplayPort input on the external monitor. Make sure the adapter or cable supports power delivery of at least 90W to ensure your MacBook Air can charge while connected to the monitor. Once connected, your MacBook Air should automatically detect the external monitor and you can adjust the display settings in the System Preferences to extend or mirror your desktop. **

To calculate how long you can safely operate a 230V device with 90W power using a camper van battery with 66Ah and a voltage converter from 12V to 230V, you can use the formula: Operating time (hours) = Battery capacity (Ah) / (Device power (W) / Voltage converter efficiency). Assuming an efficiency of around 90% for the voltage converter, the operating time would be approximately 4.4 hours (66Ah / (90W / 0.9)). It's important to note that this calculation is an estimate, and actual operating time may vary based on factors like battery condition and actual power consumption of the device. **

Self-luminous bodies are objects that emit their own light, as opposed to reflecting light from another source. Examples of self-luminous bodies include stars, the sun, and certain types of light bulbs. These objects generate their own energy through processes like nuclear fusion or electrical current, which produces light as a byproduct. **

No, the luminous clock is not radioactive. The luminescence in the clock is typically achieved using a phosphorescent material that absorbs light and then slowly releases it over time. This process does not involve any radioactive materials. The glow from the clock is simply a result of this light-absorption and emission process. **