### 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.

### 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**:

Connect in series with load and

voltage source.

Varies in the current.

voltage source.

Varies in the current.

**Potentiometer**:

Three terminals.

Ends connected across the

voltagesource.

voltagesource.

Third variable arm part tap off the

voltage.

voltage.

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