Explanation:
Physical quantities are usually designated as either vector or scalar quantities.
There are several fundamental quantities know out there that makes definition of the world possible. Derived quantities are obtained from these fundamental quantities.
- A vector quantity expresses a quantity that shows both magnitude and direction.
- With a vector, you know the amount or quantity of measurement taken and the directional attribute.
- A scalar quantity is a quantity that shows magnitude but no direction.
- For example velocity is a vector and speed is a scalar. If a body moves at 10m/s due east, that is a vector.
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Answer:
Explanation:
The sensor contains an LDR which has a resistance of 10kohlms in daylight and 100kohlms in the dark.
If the resistor in the circuit is 1 megaohlm, the total resistance in daylight and darkness will be 1.01 megaohms and 1.1 megaohlms.
The percentage difference = (1.1-1.01)/1.1*100% = 8.18%
If the resistor in the circuit is 25 kohlm, the total resistance in daylight and darkness will be 35 kohms and 125 kohlms.
The percentage difference = (125-35)/125*100% = 72%
With the input p.d to the sensing circuit fixed at 12 v, the sensing current will change according to the total resistance. A 72% difference is much more detectable. So the 25 kohm resistor is the better choice.
They recorded the first references to electrical effects, such as static electricity and lightning, over 2,500 years ago. It was not until 1600 that a man named Dr. William Gilbert coined the term “electrica,” a Latin word which describes the static charge that develops when certain materials are rubbed against amber.
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