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## Electric Current and Conductor

I have a question based on current as we all know that current flows due to the movement of electrons in substance. Now suppose a conductor having electrons randomly in motion so we study that current

## A Question from Current Electricity

Pratham asked:

The resistances of 2 bulbs are in the ratio 1:2.if they are joined in series,find the ratio of the energy consumed by the 2 bulbs?

**Answer**:

When connected in series, the same current

## Electricity – Class X CBSE

Some important points to remember

- The resistance of a conductor does not change when the current through it is changed or the voltage across it is changed. When current is changed, the voltage

## Numerical Problems for Practice – Current electricity

- At room temperature (27
^{o}C) resistance of a heating element is 100 ohm. What is the temperature of the element if the resistance is found to be 117 ohm. Given, temperature coeff. of

## Current electricity – Numerical problems

- In a potentiometer arrangement a cell of emf 1.25 V gives a balance point at 35 cm length of the wire. If the cell is replaced by another cell, the balance point shifts to 63 cm. What is the emf of the second cell?

E1= 1.25 V

l1 = 35 cm

l2 = 63 cm

E1/E2 = l1/l2

E2 = l2E1/l1

E2 = 63 x 1.25/35

E2 = 2.25 V (Ans)

**A Problem for Practice**

A storage battery of emf 8 V and internal resistance 0.5 ohm is charged by 120V dc supply

## Potential Difference

*Pawan Asked*

“What is meant by potential difference?”

**Answer:**

*?Potential Difference between two points is the difference in Potential between the two points and is equal to the work*