An LDR is a component that has a (variable) resistance that changes with the light intensity that falls upon it. This allows them to be used in light sensing circuits. LDR circuit symbols Enclosed LDR Typical LDR resistance vs light intensity graph The most common type of LDR has a resistance that falls with an […]
The name Arduino is an Italian masculine first name, meaning “strong friend” http://en.wikipedia.org/wiki/ Arduino . It’s a microcontroller based on a PIC chip family of microcontrollers. They have a small programme preloaded to make it possible to programme them from a normal PC – generally in some variation of ” C”. Arduino is an open […]
The word thermistor is a compound word derived from “thermo” (meaning heat) and resistor. It is actually a combination of heat and resistor, as its resistance vary directly or inversely to the temperature. So, there are basically two types of thermistors, which are: NTC and PTC NTC means Negative Temperature Co-efficient, and its resistance varies […]
If you have not gotten your fill of voltage dividers yet, in this section we’ll evaluate how Ohm’s law is applied to produce the voltage divider equation. This is a fun exercise. If you are interested, prepare for some tours with Ohm’s law and algebra. Voltage Divider formula Derivation Evaluating the circuit So, what if […]
Before we get down with voltage divider and the rule, let us quickly checkout on Voltage, Current and Resistance. As these make up the ohm’s law. Volt age Voltage is how much energy is between two points on a circuit. These two points have different charges, one is higher and the other is lower. The […]
Most circuits have more than one component, called a resistor that limits the current flow in the circuit. It is the measure of this limit on current flow, that is called resistance and its unit is the ohm. Considering the photo below, the VOLT pushes the AMP (current) through the circuit, while OHM, “the […]
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