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What is the purpose of a rheostat in the determination of an unknown resistor?
Wiki User
∙ 14y ago
In a bridge circuit the unknown resistor is compared to the rheostat. When the meter across the bridge reads in the middle the unknown and the rheostat are the same value.
Wiki User
∙ 14y ago
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What is the difference between direct and indirect measurement in surveying?
Direct Measurement: Apply the instrument directly to the unknown quantity. E.g. Taped distance, direction measured with a theodolite Indirect Measurement: Determined from its relationship to direct measurements. E.g. height difference determination in trigonometric leveling
An 8.192-mL sample of an unknown has a mass of 9.02gWhat is the density of the unknown?
1.10
What color is Francium?
the color is unknown
What is the oceans elevation level?
the elevation of the ocean is currently unknown
Which properties can you use to identify an unknown mineral?
chemical analysis
What is the necessity for balancing wheatstone bridge?
just to find out our given unknown resistance value or to put it another way, To find the value of the unknown resistor attached.
State 3 functions of wheatstone bridge?
Wheatstone bridge is used to calculate the resistance of unknown resistor in the circuit.
Modern electronic multimeter measures resistances by?
forcing a constant current and measuring the voltage across the unknown resistor.
Ten application of redox titration?
1-determination of ferrous [Fe+2] ion in a sample solution in(g\L).2-determination of (ferrous and ferric )in a mixture. 3-determination of purity of KClO3 sample. 4-determination of [fe+2] in unknown sample. 5-determination of total iron [Fe] in an iron ore. 6-determination of [Fe+3] in a sample. 7-determination of available chlorine in bleaching powder.
What is the purpose of dissolving unknown Fe in the acid?
The purpose is to prepare a sample solution for analysis.
How do you find unknown value of a resistor when total resistor values and voltage are known in a series circuit?
A: If you know the total resistance and total voltage then you know total current flow for the circuit, this current will be same for every resistor in series however the voltage drop will change for each resistor . So measuring the voltage drop across the resistor in question and divide by the total current will give you the resistor value.
What size resistor in parallel to reduce from 120 volts to 100 volts?
A resistor in parallel with a voltages source will not cause the voltage to drop, theoretically. To get a 20 volt drop you need a resistance in series, and the number of ohms is 20 divided by the current in amps. If the current is unknown or variable, the voltage can't be dropped by using a resistor.
What was the purpose of the break in?
The purpose of the Watergate break- in was.......that there was another tape famously features an 18 1/2 minute gap of unknown purpose or origin.
How do you solve a equation using unknown variables?
You don't use unknown variables to solve an equation. The purpose of solving an equation is to find the value of the variable so that it's no longer unknown.
What is meant by a mixed melting-point determination?
"Mixed melting point determination" is a term used in chemistry. Organic substances have a fixed temperature at which they liquify. If a chemist wants to determine the nature of an unknown substance, he can determine it by these means. If the unknown substance does not melt at the usual temperature, it can be said to be impure. If the chemist has two unknown substances and wants to determine what they are, he may mix equal parts of each and start the liquification process. If the combination melts at the usual temperature, the chemist can say that both are the same. If the chemist wants to determine the nature of an unknown substance, he may mix a fixed amount of a known substance with a fixed amount of an unknown substance, it can be estimated, what the unknown substance is.
What was the purpose of the Watergate break-ins?
The purpose of the Watergate break- in was.......that there was another tape famously features an 18 1/2 minute gap of unknown purpose or origin.
What purpose did myths serve for the Greeks?
It was in a way a religion, they made it to help understand the unknown.
