Friday, 20 January 2017

QUESTIONS ANSWER ABOUT THE CURRENT, RHEOSTAT AND POTENTIOMETER

Q.1 (PART A) Why is current (I) is same in all parts of series?

Ans: 
The current is the same everywhere in a series circuit.
The total resistance is equal to the sum of the individual resistance values.
The total voltage is equal to the sum of the IR voltage drops across the individual resistances.
The total power is equal to the sum of the power dissipated by each resistance.
Current is the movement of electric charge between two points, produced by the applied voltage.
All electrons have the same speed as those leaving the voltage source.
Therefore, I is the same in all parts of a series circuit.
series circuit
series circuit













Q.1 (PART B) Diffrenciate b/w rehostate & potentiometer?

ANSWER) Rheostats and potentiometers are variable resistances used to vary the amount of current or voltage in a circuit.

 Rheostats:
rheostatsTwo Terminals.
Connect in series with load and
voltage source.
Varies in the current.

Potentiometer:
Three terminals.
Ends connected across the
voltagesource.
Third variable arm part tap off the
voltage.



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