Arun Raja said:When there is low light, resistence of LDR increase [strike]to produce light[/strike].
A potential divider is an electrical circuit consisting of two or more resistors connected in series that divides the input voltage into smaller output voltages. It is commonly used to control the output voltage of a circuit by adjusting the values of the resistors.
A potential divider works by using the ratio of the resistances in the circuit to divide the input voltage. The output voltage is determined by the ratio of the resistance values, with a higher resistance resulting in a smaller output voltage and vice versa.
The formula for calculating the output voltage in a potential divider is Vout = (R2 / (R1 + R2)) * Vin, where R1 and R2 are the resistances in the circuit and Vin is the input voltage. This assumes that the output is taken from the junction between the two resistors.
The formula R(R+r)*E=V is often wrong because it is a simplified version of the actual potential divider formula and only works in certain cases. It assumes that the output voltage is taken from the junction between the two resistors, but if the output is taken from a different point in the circuit, this formula will not give the correct result.
To ensure that you are using the correct formula for a potential divider, it is important to understand the concept and principles behind it. The most accurate formula is Vout = (R2 / (R1 + R2)) * Vin, but it is also important to consider the placement of the output and any other factors that may affect the circuit. It is always best to double check your calculations and consult a reliable source if you are unsure.