The relationship between current, voltage, and resistance is described by I = V / R. For a resistor with fixed resistance, increasing the voltage raises the current proportionally, because more voltage pushes more charge through the same amount of resistance. So turning up the voltage effectively increases current. Increasing the resistance would reduce current, and decreasing the voltage would also reduce current. Temperature changes can alter resistance, but raising room temperature typically increases resistance for many common resistors, which would not help to increase current.

Pins on an Arduino are categorized into digital and analog. Digital pins work as on/off channels—you set them HIGH or LOW and use them for simple binary signals like turning an LED on or off or reading a button. Analog pins, on the other hand, read varying voltages through the board’s analog-to-digital converter, letting you measure sensors whose output isn’t just on or off. They typically give a numeric value corresponding to the voltage you feed in (for example, a 10‑bit scale from 0 to 1023 on many boards). Some boards also allow using analog pins as digital pins when extra I/O is needed, but their primary role is to read analog signals.

On the Internet, every device is identified by an IP address, which serves as the unique routing label used by routers to deliver packets to the correct destination. This numerical address is what enables data to flow from one device to another across interconnected networks, whether the device uses IPv4 or IPv6, and whether it sits behind a private network or is reachable publicly. Human-friendly names or URLs do not function as the actual routing identifiers; names are translated to IP addresses by DNS before any data can be sent. A gateway address refers to the router’s address on a local network, not the individual device’s global identity. A device name is useful for humans but isn’t guaranteed to be unique across networks, and a URL points to a resource on the Web, not to the device itself. Thus, the IP address is the standard, widely used identifier that distinguishes devices on the Internet.

CRM stands for Customer Relationship Management, which is about how a business manage interactions with customers throughout their lifecycle. It’s both the philosophy and the technology that bring sales, marketing, and customer service together so you can track who your customers are, what they’ve bought or asked for, and how they’ve been engaged. The goal is to build better relationships, improve satisfaction and loyalty, and ultimately drive more sales. In practice, a CRM system stores contact details, track communication history, manage sales opportunities, log service requests, and coordinate marketing campaigns, giving a single view of the customer. The other terms aren’t used in the same sense: they would suggest managing research activities or measuring research results about customers, rather than actively managing the ongoing relationships and interactions across touchpoints. In IoT contexts, a CRM helps connect device usage and service needs to individual customers, enabling proactive support and personalized experiences.