You can buy cardboard with the dimensions 1m x 1m at various places such as office supply stores, craft stores, packaging supply stores, and online retailers. Look for specialty stores that sell large sheets of cardboard or contact local packaging companies to inquire about purchasing cardboard sheets in the specific size you need. Additionally, you can check with local hardware stores or home improvement centers as they may carry large sheets of cardboard for various purposes. **

Yes, direct current can be distributed across multiple cables. By connecting multiple cables in parallel, the total current can be divided among the cables, allowing for the distribution of the direct current across them. This method is commonly used in electrical systems to ensure that the current is evenly distributed and to prevent overloading of individual cables. **

To determine the polarity of cables in direct current, you can use a multimeter set to the DC voltage setting. Connect the red probe to the positive terminal of the cable and the black probe to the negative terminal. If the multimeter shows a positive reading, then the red probe is connected to the positive terminal. If the reading is negative, then the red probe is connected to the negative terminal. This method helps you identify the polarity of the cables accurately. **

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No, you do not necessarily need thicker cables for direct current (DC) than for alternating current (AC). The current-carrying capacity of a cable is determined by factors such as the material, size, and insulation of the cable, as well as the voltage and current being carried. Both DC and AC have their own unique considerations when it comes to cable sizing, but the need for thicker cables is not inherently tied to the type of current being carried. It ultimately depends on the specific requirements of the electrical system and the application. **

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In direct current (DC) systems, the stress on cables is relatively constant because the current flows in one direction continuously. This results in a steady and predictable stress level on the cables. On the other hand, in alternating current (AC) systems, the stress on cables fluctuates as the current changes direction periodically. This can lead to higher stress levels on the cables, especially during peak currents, which may require cables to be designed to withstand these fluctuations. **

The voltage tester lights up on both cables in direct current because in a direct current circuit, the flow of electric charge is unidirectional. This means that the current flows from the positive terminal to the negative terminal of the power source. When the voltage tester is connected to the cables, it detects the presence of electric potential difference between the two points, causing the light to illuminate on both cables. This indicates that there is a voltage present in the circuit, regardless of the direction of the current flow. **